The State of New Jersey

Department of Environmental Protection

Proposed Revisions to the Enhanced Inspection and 

Maintenance (I/M) Program for the State of New Jersey

Proposed I/M Program Modeling and Revised 

Performance Standard Modeling 

SIP Revision

Appendix I

History of New Jersey’s I/M SIP

August, 2009

1

History of New Jersey’s I/M SIP 

A. Basic I/M SIP 

In 1974, New Jersey, under commitments made in its basic I/M SIP, implemented its 

basic I/M program. At that time, the State’s basic I/M SIP consisted of an annual 

inspection program whereby all gasoline-fueled motor vehicles, unless specifically 

exempt through law or regulation, were subject to an idle exhaust emission test. 

Although several subsequent revisions were made to the State’s basic I/M SIP, the core 

program remained unchanged. Major changes in the State’s basic I/M program over 

time included: 1) the addition of a visual inspection for the presence of a catalytic

converter, 2) the addition of an inlet restrictor test to determine whether a vehicle’s fuel 

inlet was sufficiently narrow as to preclude use of a leaded gasoline nozzle, thereby 

preventing the use of leaded fuel, and 3) modification of the program network design to 

allow for private inspection facilities (PIFs). This third major change expanded the 

inspection facility network to include non-state-operated inspection facilities that could 

do both inspections and repairs. Although these private facilities were originally only 

allowed to perform re-inspections, their responsibilities were later augmented to include 

initial inspections as well.

B. Enhanced I/M SIP 

The Clean Air Act Amendments of 1990 require the implementation of enhanced I/M 

programs for areas meeting one or more of the following criteria:

1) Designated as a serious, severe or extreme ozone non-attainment area with 

urbanized populations of 200,000 or more1;

2) Designated as a carbon monoxide non-attainment area that exceeded a 12.7 

ppm design value with urbanized populations of 200,000 or more2; or,

3) Part of a Metropolitan Statistical Area with a population of 100,000 or more in the 

northeast Ozone Transport Region (OTR)3.

New Jersey met all three of these criteria for required implementation of an enhanced 

I/M program. As part of this requirement, Congress established performance 

specifications that were further elucidated by the USEPA. Specifically, the USEPA’s 

 

1

 42 U.S.C.A. §7511a (c)(3).

2

 42 U.S.C.A. §7512a(a)(6).

3

 42 U.S.C.A. §7511c(b)(1)(A).
2

promulgated rules and established guidance, including a performance standard and 

program administration features, for the implementation of enhanced I/M programs. 

The USEPA’s final rule on Inspection/Maintenance Program Requirements was 

promulgated on November 5, 1992.4 Subsequently, on June 29, 1995, New Jersey 

submitted a SIP to the USEPA that described its enhanced I/M program design. This 

SIP described an inspection program whereby all 1968 and newer gasoline-fueled 

motor vehicles, unless specifically exempt through law or regulation, would be subject 

to a steady-state dynamometer-based exhaust emission test known as the ASM5015. 

In addition, all 1975 and newer vehicles would receive evaporative pressure and purge 

tests designed to detect any malfunctions with the vehicle’s evaporative emission 

control system. All pre-1968 vehicles would continue to be subject to the idle exhaust 

emission test. New Jersey’s enhanced I/M SIP also accounted for a hybrid (i.e., both 

centralized, test-only and decentralized, test-and-repair facilities) inspection network, 

similar to the one established for New Jersey’s basic I/M program. This SIP stated that 

once the enhanced I/M program was fully implemented, all subject motor vehicles 

would be inspected at least once every two years (i.e., biennially).

C. Enhanced I/M SIP Revision - March 27, 1996 

On March 27, 1996, New Jersey submitted a revision to its June 29, 1995 enhanced I/M 

SIP, modifying its enhanced I/M program design to take advantage of the additional 

flexibility afforded states by Congress in designing their enhanced I/M programs. 

Specifically, the National Highway System Designation Act of 1995, P.L. 104-59 

[S.440], (NHSDA) prohibited the USEPA from automatically discounting decentralized 

program formats by 50 percent, as had previously been prescribed in the USEPA’s final 

rule on I/M program requirements.5 Rather, the NHSDA allowed states to claim any 

reasonable amount of credit for their decentralized programs that they deemed 

appropriate, so long as 18 months from the approval of their enhanced I/M SIP the 

state could show six months of full implementation enhanced I/M program data 

substantiating their credit claim. Consistent therewith, as part of its March 27, 1996 

enhanced I/M SIP revision, New Jersey claimed 80 percent credit for the decentralized 

portion of its enhanced I/M program. Refer to Section F. for more information on New 

Jersey’s analyses to substantiate its 80 percent credit claim.

In addition to taking advantage of the flexibility afforded by the NHSDA, the March 27, 

1996 enhanced I/M SIP revision modified the model year coverage of the ASM5015 

exhaust emission test and evaporative system pressure and purge tests to the 

following: all 1981 and newer light-duty vehicles, other than low annual mileage and fulltime four-wheel drive vehicles, would be subject to the steady-state dynamometerbased ASM5015 exhaust emission test, as well as evaporative system pressure and 

purge tests. Vehicles 1980 and older would continue to be subject to the basic idle 

 

4

 40 C.F.R.§51, 57 Fed. Reg. 52987 (November 5, 1992). 

5

 40 C.F.R. §51.353, 57 Fed. Reg. 52990 (November 5, 1992).
3

exhaust emission test, as well as a gasoline cap pressure test for those vehicles with 

sealed gas cap systems.

Finally, as part of this March 27, 1996 revision to the State’s enhanced I/M SIP, the test 

frequency of the State’s current inspection process was slightly modified in connection 

with an enhanced demonstration phase. During this demonstration phase, vehicles that 

successfully passed a voluntary enhanced exhaust emission test would receive an 

inspection sticker valid for two years. 

On May 14, 1997, the USEPA granted conditional interim approval to New Jersey’s 

enhanced I/M SIP.6 This conditional interim SIP approval, which became effective on 

June 13, 1997, addressed both the State’s original June 29, 1995 enhanced I/M SIP 

submittal and its subsequent March 27, 1996 SIP revision. New Jersey subsequently 

satisfied the conditions of this approval by rectifying the two major deficiencies in its 

enhanced I/M SIP identified by the USEPA (New Jersey cured the first major enhanced 

I/M SIP deficiency by providing final and complete test equipment specifications, test 

procedures and emission standards to the USEPA by January 31, 19977; and cured the 

second major enhanced I/M SIP deficiency by providing enhanced I/M performance 

standard modeling to the USEPA by February 1, 19988). In addition, on December 14, 

1998, New Jersey cured the eight (8) de minimis deficiencies identified by the USEPA9, 

even though the satisfaction of those de minimis deficiencies had no effect on the 

USEPA’s interim approval.10

D. Enhanced I/M SIP Revision - June 5, 1998 

On June 5, 1998, New Jersey submitted a revision to its I/M SIP, clarifying the testing 

frequency during the transition between the basic I/M program and the full 

implementation of the enhanced I/M program. Although the previous SIP revisions 

 

6

 40 C.F.R. 52, 62 Fed. Reg. 26401 (May 14, 1997).

7

 These documents were submitted as an attachment to a letter dated January 31, 1997 

from Commissioner Robert C. Shinn, Jr., New Jersey Department of Environmental 

Protection, to Jeanne M. Fox, Regional Administrator, USEPA, Region II.

8

 This modeling and its supporting documentation were submitted as an attachment to a 

letter dated January 30, 1998 from Commissioner Robert C. Shinn, Jr., New Jersey

Department of Environmental Protection to William J. Muszynski, P.E., Deputy Regional 

Administrator, USEPA, Region II.

9 The State of New Jersey Department of Environmental Protection, Revision to the State 

Implementation Plan (SIP) for the Inspection and Maintenance (I/M) Program for the State 

of New Jersey, December 14, 1998.

10

 61 Fed. Reg. 56172, (October 31, 1996).
4

clearly define the testing frequency of both New Jersey’s basic and enhanced I/M 

programs, they did not definitively specify the testing frequency during the transition 

period between the two programs.

As part of the June 5, 1998 SIP revision, the State determined that during the transition 

period, the basic I/M program would continue to operate, but on a biennial, rather than 

annual, test frequency. This was done to accommodate the decreased availability of 

centralized inspection lanes while they were being retrofitted for enhanced testing. To 

make this modification to the basic I/M program’s test frequency, this SIP revision 

quantified the emission reduction losses anticipated from this modification and provided 

an equivalency demonstration showing the State’s plan to offset those losses in 

emission reduction benefit. Specifically, to compensate for the loss in VOC emission 

reduction benefit from modifying the basic I/M program’s test frequency, New Jersey: 1) 

began administering fuel cap pressure tests as part of its basic I/M program in its 

centralized inspection facilities, and 2) began fuel cap/evaporative emission control 

system visual inspections as part of its basic I/M program in its decentralized inspection 

facilities. The loss in carbon monoxide emission reduction benefit from modifying the 

basic I/M program’s test frequency was offset by taking credit for emission reduction 

benefits gained through vehicle fleet turnover which had not already been claimed by 

the State in its carbon monoxide SIP.11 Vehicle fleet turnover results when newer 

vehicles with more advanced emission controls replace older, less advanced vehicles 

within the State vehicle population. The State submitted modeling analyses showing 

that both of the above strategies more than compensated for the loss in VOC and 

carbon monoxide emission reduction benefits from modifying the basic I/M program’s 

test frequency. The USEPA approved the State’s June 5, 1998 revision to its enhanced 

I/M SIP on August 26, 1998.12

E. Proposed Enhanced I/M SIP Revision - June 9, 2001

On June 9, 2001, the State proposed to revise its enhanced I/M SIP to include 

amendments to the NJMVC’s rules governing the implementation and operation of the 

State’s I/M program. The proposed rulemaking13 made the following changes to the 

 

11

 The New Jersey State Implementation Plan (SIP) Revision for the Attainment and 

Maintenance of the Carbon Monoxide National Ambient Air Quality Standard, November 17, 

1994. The State, on July 10, 1997, proposed a revision to this SIP. A hearing on this 

proposal took place on August 11, 1997 and the comment period closed on August 20, 

1997. This SIP revision was submitted to the USEPA on August 7, 1998. To date, the 

USEPA has taken no action on New Jersey’s submittal.

12

 63 Fed. Reg. 45402 (August 26, 1998).

13

 33 N.J.R. 1894(a) (June 4, 2001).
5

NJMVC’s I/M regulations that could impact the air quality benefits associated with the 

enhanced I/M program, and therefore impact the SIP:

 Provide that if leasing companies and out-of-state new motor vehicle dealerships 

inspect a new motor vehicle’s safety and emission control devices to insure that they 

conform to the specifications established by the manufacturer and contained in the 

pre-delivery checklist, those facilities could issue a temporary inspection decal. This 

decal allows the motorist to present the vehicle at the exit end of any CIF and be 

issued a two-year inspection decal. This regulatory change gives these leasing 

companies and out-of-state new motor vehicle dealerships equivalent privileges to 

those previously given to in-state new motor vehicle dealerships;

 Exempt gasoline-fueled school buses which are subject to inspection by the 

NJMVC’s School Bus Inspection Unit from the inspection requirements of the 

enhanced I/M program;

 Allow any motor vehicle that passes an on-road inspection within the two-month 

period prior to its regularly scheduled biennial inspection to use the on-road 

inspection result in lieu of the complete biennial inspection, so long as the tests 

performed on-road are the same tests that would be performed on the vehicle as 

part of the biennial inspection process;

 Exempt from dynamometer testing any motor vehicle “ with a chassis height that has 

been modified so as to make its operation on a dynamometer either impractical or 

hazardous, as will be determined in the discretion of the Director [of the NJMVC]”; 

and, 

 Change the minimum cost expenditure value needed for the issuance of a cost 

waiver from $200 to $450 as of January 1, 2002.

A hearing on this proposed SIP revision, as well as the NJMVC’s proposed rulemaking, 

was held on July 9, 2001. The NJMVC subsequently adopted its regulations on 

October 15, 2001.14 

F. Enhanced I/M SIP Revision - August 31, 2001 

On December 13, 2000, in compliance with its NHSDA credit claim, New Jersey 

submitted to the USEPA a qualitative analysis of four months of data showing the 

effectiveness of the decentralized portion of its enhanced I/M program relative to its 

centralized test-only network.

15

 Subsequently, on May 4, 2001, New Jersey proposed 

its final report for NHSDA compliance, which evaluated six full months of program 

 

14

 33 N.J.R. 3651(b) (October 15, 2001).

15 The State of New Jersey Department of Environmental Protection, Report on the 

Inspection and Maintenance (I/M) Program for the State of New Jersey, National Highway

Systems Designation Act (NHSDA) Submittal, December 13, 2000.
6

implementation data (the period from July 1, 2000 through December 31, 2000) using 

various analysis methodologies. On August 31, 200116, the State of New Jersey 

submitted to the USEPA a revision to its enhanced I/M SIP that included: 

1) The State’s final submittal for compliance with the National Highway Systems 

Designation Act (NHSDA); and, 

2) A revision to New Jersey’s enhanced I/M performance standard modeling.

The first part of this SIP revision included New Jersey’s final NHSDA report. This report 

was designed to support the claim New Jersey made in its March 27, 1996 enhanced 

I/M SIP revision that its decentralized network (the private inspection facilities, or PIFs) 

is at least 80 percent as effective as its centralized network (the centralized inspection 

facilities, or CIFs). The NHSDA report showed that both New Jersey’s centralized testonly and decentralized test-and-repair program networks are effectively identifying 

vehicles with unacceptably high levels of emissions, and that the State-registered 

Emission Repair Facilities (ERFs) are significantly reducing vehicle emissions through 

effective repairs. Specifically, the NHSDA analyses show overall emission reductions 

of 55 percent for hydrocarbons (HC), 58 percent for nitrogen oxide (NO) and 84 percent 

for carbon monoxide from the vehicles repaired and successfully passing re-inspections 

following initial inspection failures. These analyses show relatively uniform emission 

reductions attributable to both network types of New Jersey’s enhanced I/M program, 

indicating that the emission reductions attributable to the PIFs are at least 80 percent of 

those attributed to the CIF network. In fact, the analyses show that the State was 

conservative in this original credit estimation.

The second part of the August 20, 2001 enhanced I/M SIP revision addressed the 

State’s performance standard modeling for its enhanced I/M program. The State 

originally submitted its performance standard modeling to the USEPA on January 30, 

1998, to satisfy a condition of the USEPA’s conditional interim approval of New Jersey’s 

enhanced I/M program SIP.17 At that time, the State had not yet implemented its 

enhanced I/M program, requiring the NJDEP to make certain assumptions about the 

program, such as the expected date for the implementation of final standards. After the 

State successfully implemented its enhanced I/M program, the USEPA requested that 

the State update its performance standard modeling to more accurately reflect the 

program as implemented. The August 20, 2001 revised performance standard modeling 

demonstrated that for an evaluation year of 2002, the State exceeded the applicable 

enhanced performance standard. 

On September 11, 2001, the USEPA proposed to: 1) approve New Jersey’s August 20, 

2001 SIP revision; and, 2) give final approval to New Jersey’s overall enhanced I/M SIP.

 

16

 Although this document was submitted to the USEPA on August 31, 2001, the date on the 

SIP submittal document is August 20, 2001.

17

 40 C.F.R. 52, 62 Fed. Reg. 26401 (May 14, 1997).
7

Prior to this, the State’s enhanced I/M SIP had interim approval from the USEPA. On 

January 22, 2002, the USEPA finalized its approval of New Jersey’s August 20, 2001 

SIP revision and gave final approval to New Jersey’s overall enhanced I/M SIP.18 

G. Proposed Enhanced I/M SIP Revision - December 31, 2001 

On December 31, 2001, the State of New Jersey submitted a proposed revision to its 

enhanced I/M SIP to the USEPA.19 This proposed revision included the following:

1) A formal request to defer of the mandatory implementation date for inclusion of OnBoard Diagnostic (OBD) inspections into the State’s I/M program from January 1, 

2002 to January 1, 2003; 

2) A formal request that the State be allowed to phase-in the mandatory OBD 

inspection portion of its I/M program;

3) Submittal, for inclusion as part of the overall enhanced I/M SIP, of those proposed 

amendments to the Department of Environmental Protection’s (NJDEP) rules which 

establish the necessary test procedures and standards for implementation of an 

enhanced I/M program for gasoline-fueled motor vehicles in New Jersey; and, 

4) Submittal, for inclusion as part of the overall enhanced I/M SIP, of those emissionrelated portions of the NJMVC-proposed amendments to its rules governing school 

bus inspections in New Jersey.20

The proposed NJDEP regulatory amendments were attached as Appendix I to the 

December 31, 2001 proposed SIP submittal and proposed the following major 

modifications to N.J.A.C. 7:27-15 (Control and Prohibition of Air Pollution from 

Gasoline-Fueled Motor Vehicles) and N.J.A.C. 7:27B-5 (Air Test Method 5: Testing 

Procedures for Gasoline-Fueled Motor Vehicles):

 Modify the framework, procedures and testing schedule by which 1996 and newer 

model year vehicles will be subject to OBD inspections;

 

18

 67 Fed. Reg. 2811 (January 22, 2002).

19

 Submitted December 31, 2001 under cover letter from then NJDEP Commissioner Robert C. 

Shinn, Jr. to Jane M. Kenny, Regional Administrator, USEPA Region II.

20

 Please note that the NJDMV’s school bus rule proposal was forwarded to the USEPA under 

separate cover from the original proposed SIP revision. Specifically, this proposal was 

forwarded on March 26, 2001 from Chris Salmi, Manager of the Bureau of Air Quality Planning in 

the NJDEP to Raymond Werner, Chief of the Air Programs Branch, USEPA - Region II.
8

 Extend the end date for the current initial ASM5015 standards for all 1981 and 

newer light duty gasoline vehicles (LDGVs), light duty gasoline trucks 1 and 2 

(LDGT1s and LDGT2s)21 from December 31, 2001 to December 31, 2002;

 Replace the final standards for the ASM5015 exhaust emission test for all model 

year 1994 and newer Tier I light-duty gasoline-fueled trucks 1 and 2 (LDGT1 and 

LDGT2s), currently scheduled for implementation on January 1, 2002, with new 

"interim" standards that will go into effect on January 1, 2003;

 Replace the final standards for the ASM5015 exhaust emission test for all pre-1996 

non-Tier I LDGT1s and LDGT2s, and for all 1981 and newer light-duty gasolinefueled vehicles (LDGVs) with the current initial ASM5015 standards for those 

vehicles, and change the implementation date from January 1, 2002 to January 1, 

2003;

 Remove all references to the evaporative pressure and purge tests, and;

 Change the test procedure requirements for those gasoline-fueled motor vehicles 

registered as school buses by the NJMVC, and subject to inspection by the 

NJMVC's School Bus Inspection Unit.

A hearing on the proposed SIP revision, as well as both NJDEP and NJMVC’s 

proposed rulemakings, was held on February 25, 2002. The State received significant 

comments on two aspects of its January 22, 2002 proposal; the implementation plan for 

integrating mandatory OBD inspections, and the implementation of interim standards 

for the ASM5015 exhaust emissions test to replace the current final standards. 

In addition to considering the comments, the NJDEP also took into account other 

factors with regard to OBD implementation, such as the determination that 

implementation of the USEPA's original OBD inspection component design without 

"second chance" testing would impose less of a burden on the State than 

implementation of a "phase-in" OBD inspection program that still required the motor 

vehicle to be repaired to pass an OBD inspection on re-inspection. After evaluating all 

of these issues, the State determined not to adopt the proposed OBD implementation 

plan or the interim standards for ASM5015 exhaust emission test. Although the State 

considered adopting the remaining changes proposed in its January 22, 2002 proposal, 

it determined that it would be clearer to the public if the NJDEP developed a new 

proposal that included the State's revised OBD implementation plan, and provided for 

continuation of the initial ASM standards without the implementation of final standards. 

As such, the NJDEP determined not to adopt its January 22, 2002 rule proposal and, 

on April 22, 200222, the NJDEP submitted a SIP revision that took the following action 

with regard to the State’s enhanced I/M program: 

 

21 To determine whether a vehicle is classified as a LDGV, LDGT1, LDGT2 or HDGV please 

refer to the definition section of the NJDEP’s rules at N.J.A.C. 7:27-15.1.

22

 The State of New Jersey Department of Environmental Protection, Enhanced Inspection and 

Maintenance (I/M) Program for the State of New Jersey, Request to Defer the Integration of OnBoard Diagnostic (OBD) Inspections into the State’s I/M Program, SIP Revision, April 22, 2002.
9

1)Withdrew the State’s request to phase-in OBD inspections into New Jersey’s 

enhanced I/M program;

2)Withdrew the State’s submittal of the January 22, 2002 NJDEP rule proposal, 

and; 

3)Submitted a final SIP revision requesting a deferral of the mandatory 

implementation date for inclusion of OBD inspections into the State I/M program 

from January 1, 2002 to January 1, 2003. This request included a commitment to 

modify the rule date for OBD inspection.

In the letter transmitting this SIP revision to the USEPA, the State indicated that, should 

the NJMVC act to adopt its latest school bus rule proposal, the NJDEP would then 

submit to the USEPA for their review and approval, a final SIP revision that includes 

that adoption, as well as the NJMVC’s previous rule adoption which removed from the 

I/M program those gasoline-fueled vehicles registered as school buses, and thus 

subject to inspection by the NJMVC’s school bus inspection unit, from the enhanced I/M 

program requirements. This second rule adoption was submitted to the USEPA as a 

proposed SIP revision on June 9, 2001 and the adoption appeared in the October 15, 

2001 edition of the New Jersey Register. 

H. Proposed Enhanced I/M SIP Revision - April 24, 2002

On April 24, 2002, the NJDEP submitted a revision to its enhanced I/M SIP that 

consisted of proposed amendments to the NJDEP rules governing the implementation 

of the enhanced I/M program in New Jersey. Specifically, the NJDEP's rule proposal 

made the following major changes to the State’s enhanced I/M program:

 Modified the framework, procedures and testing schedule by which model year 1996 

and newer vehicles would be subject to on-board diagnostic (OBD) inspections. 

The proposed program modifications included changing the start date for mandatory 

OBD inspections (pass/fail determinations) from January 1, 2001, to June 1, 2003. 

The proposal set forth the testing protocols for OBD inspections on 1996 and newer 

vehicles;

 Eliminated the end date for the use of the “initial” emission standards for the 

ASM5015 exhaust emission test. This would allow for the continued use of these 

initial standards;

 Removed the "final" emission standards for the ASM5015 exhaust emission test23;

 

23

 Although the NJDEP proposed the elimination of the final standards for dynamometer 

testing, the basis and background document for the proposal discusses the USEPA's 

intention to finalize a comprehensive set of revised final standards for the ASM5015 test, 

and the State's determination to consider including those final standards as part of its 

enhanced I/M program, once they are made available. 
10

 Removed all references to the evaporative pressure and purge tests while retaining 

the evaporative fuel cap (or gas cap) leak test; and;

 Exempted from dynamometer testing those pre-1996 light-duty vehicles that are 

registered as school buses and that are under the jurisdiction of the NJMVC’s 

School Bus Inspection Unit. 1996 and newer light-duty vehicles registered as 

school buses would receive an OBD inspection.

A hearing on the NJDEP's new proposal, and the associated proposed SIP revision, 

was held on June 24, 2002 and the comment period ended on July 30, 2002. On 

December 15, 2003 (68 Fed. Reg. 69640), the USEPA proposed approval of this 

revision to New Jersey's enhanced I/M SIP. USEPA gave final approval of this revision 

on May 21, 2004 (69 Fed. Reg. 29234).

I. Revised Performance Standard Modeling SIP Revision - November 27, 

2002

On November 27, 2002, the NJDEP submitted a revision to New Jersey’s enhanced 

Inspection and Maintenance (I/M) program State Implementation Plan (SIP) which 

contained a revision to New Jersey’s enhanced I/M performance standard modeling. 

The primary reason for this revised performance standard modeling was to satisfy the 

USEPA's requirements for securing their approval for the State to extend the new 

vehicle emission inspection exemption from one inspection cycle (i.e., 2 years) to two 

inspection cycles (i.e., 4 years). Governor James E. McGreevey enacted this new car 

emission inspection exemption on July 1, 2002, however, implementation of this 

exemption was contingent on USEPA approval. 

In addition to the extension to the new car emission inspection exemption, New Jersey 

proposed several modifications to its enhanced I/M program design since the State's 

previous performance standard submittal on August 20, 2001. These proposed 

changes would impact the effectiveness of the overall I/M program. Specifically, the 

NJDEP proposed the following changes to its enhanced I/M regulations in the May 20, 

2002 New Jersey Register (N.J.R.):

 Modified the framework, procedures and testing schedule by which model year 1996 

and newer vehicles would be subject to on-board diagnostic (OBD) inspections. 

The proposed program modifications included changing the start date for mandatory 

OBD inspections (pass/fail determinations) from January 1, 2001, to June 1, 2003 

and set forth the testing protocols for OBD inspections on 1996 and newer vehicles;

 Eliminated the end date for the use of the “initial” emission standards for the 

ASM5015 exhaust emission test to allow for the continued use of these initial 

standards;

 Removed the "final" emission standards for the ASM5015 exhaust emission test;

 Removed all references to the evaporative pressure and purge tests while retaining 

the evaporative fuel cap (or gas cap) leak test; and,
11

 Exempted from dynamometer testing those pre-1996 light-duty vehicles that are 

registered as school buses and that are under the jurisdiction of the NJDMV’s 

School Bus Inspection Unit. 1996 and newer light-duty vehicles registered as 

school buses would receive an OBD inspection.

The NJDEP's November 27, 2002 revision revised the State's enhanced I/M 

performance standard modeling to account for the four-year new car exemption, as well 

as the NJDEP's May 20, 2002 proposed rule changes. This revision showed that for 

the evaluation years 2002, 2005 and 2007, the State's I/M program meets the low 

enhanced performance standard. On November 5, 2002 (67 Fed. Reg. 67345), the 

USEPA proposed approval of this revision to New Jersey's enhanced I/M SIP. The 

USEPA gave this revision final approval on February 18, 2003 (68 Fed. Reg. 7704).