C0142 Diagnostic Trouble Code

C0142 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C0142 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Rich or lean exhaust

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code C0142 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C0142.

Fortunately, C0142 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0142 Trouble Code For Specific Cars

C0142 Alfa Romeo 2600 Accelerate Warmup Solenoid Circuit Malfunction
C0142 Lifan X60 Throttle Control Unit Throttle Position Malfunction
C0142 Apollo Gt Air Suspension LF Height Sensor Circuit Short To Ground
C0142 Willys-overland Whippet SCP (J1850) Invalid or Missing Data for Seat Motion / Control
C0142 Suzuki Kei Mirror Driver Down Circuit Short To Battery
C0142 Skoda Winnetou Lack Of HO2S22 Switch - Sensor Indicates Lean
C0142 Lagonda 2-litre Shift Solenoid D Electrical