C0202 Diagnostic Trouble Code

C0202 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 C0202 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C0202 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 C0202.

Fortunately, C0202 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0202 Trouble Code For Specific Cars

C0202 Mercury Sable Air Suspension Reservoir Pneumatic Failure
C0202 Alvis Crested Eagle Air Bag Safing Sensor Output Circuit Short To Ground
C0202 Mercedes Cla 200 ABS Inlet Valve Coil RR Circuit Short To Ground
C0202 Hyundai Tiburon
C0202 Ford Tonka Mirror Switch Assembly Circuit Short to Battery
C0202 Weber Sportscars F1 SCP (J1850) Invalid or Missing Data for Mirrors
C0202 Mercedes-benz M Class Air Suspension Front Compressor Relay Circuit Open