DTC Mercury P0401 Short Explanation
Channel: Maxidot
Date: 2020-09-01

The video focuses on the basic Mercury specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
Mercury
Code:
P0401
Definition:
Exhaust Gas Recirculation (EGR) Flow Insufficient Detected
Description:
The EGR system is monitored during steady state driving conditions while the EGR is commanded on.The test fails when the signal from the differential pressure feedback EGR sensor indicates that EGR flow is less than the desired minimum.
Cause:
Vacuum supplyEGR valve stuck closedEGR valve leaks vacuumEGR flow path restrictedEVR circuit short to voltageVREF open to differential pressure feedback EGR sensorDifferential pressure feedback EGR sensor downstream hose is off or pluggedEVR circuit openVPWR open to EGR vacuum regulator solenoidDifferential pressure feedback EGR sensor hoses are both offDifferential pressure feedback EGR sensor hoses are reversedDamaged EGR orifice tubeDamaged EGR vacuum regulator solenoid
Diagnosis:
Carry out the key ON engine running (KOER) self-test and look for DTC P1408 as an indication of a hard fault. If DTC P1408 is not present, look for contamination, restrictions, leaks, and intermittent concerns.