DTC cadillac P0420 Short Explanation
Channel: Maxidot Cadillac
Date: 2020-06-20

The video focuses on the basic Cadillac 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: 
Cadillac 
Code: 
P0420 
Definition: 
Catalyst System Low Efficiency Bank 1 
Description: 
DTC P0016, P0053, P0054, P0059, P0060, P0068, P0101, P0102, P0103, P0106, P0111, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013C, P013D, P013E, P013F, P0140, P0141, P014A, P014B, P0151, P0152, P0153, P0154, P0155, P0157, P0158, P0160, P0161, P0171, P0172, P0174, P0175, P0220, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0335, P0336, P0340, P0341, P0443, P0606, P0641, P0651, P1133, P1153, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2270, P2271, P2272 or P2273 is not set. The engine speed is greater than 900 RPM and the vehicle speed is greater than 43 km or h (27 mph) for greater than 20 s. The fuel level is greater than 2 % if there is no fuel level DTC set, or greater than 0 % if there is a fuel level DTC set. The Engine Coolant Temperature (ECT) is between 73-128°C (164-262°F). The Barometric Pressure (BARO) is greater than 70 kPa. The catalytic converter calculated temperature is between 525-800°C (977-1,472°F). The Intake Air Temperature (IAT) is between -20 and +100°C (-4 and +212°F). The battery voltage is more than 11 V. Torque request is less than 5 N·m. The engine is in a decel fuel cutoff event for greater than 2.35 s. The Heated Oxygen Sensor (HO2S) 1 voltage is less than 300 mV prior to decel fuel cutoff exit. The HO2S 2 voltage is less than 101 mV for 2.5 s prior to decel fuel cutoff exit. 
Cause: 
Air leaks at the exhaust manifold or in the exhaust pipes
Base engine problems (i. e. , high engine oil or coolant usage)
Catalytic converter is damaged, contaminated or has failed
Continuous engine misfire conditions, or weak or low coil output
Front HO2S or rear HO2S is contaminated with fuel or moisture
Rear HO2S is loose in the mounting hole (check it for a leak)
Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)