B0202 Diagnostic Trouble Code

B0202 is a kind of OBD-II Diagnostic B-Body 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 B0202 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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.

Process Tips

Diagnostic trouble code B0202 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 B0202.

Fortunately, B0202 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0202 Trouble Code For Specific Cars

B0202 Mercedes-benz S Class Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Ground
B0202 Porsche 1300 Front Echo Sensor Circuit Failure
B0202 Cadillac Srx Dim Panel Potentiometer Switch Circuit Failure
B0202 Honda Civic Pressure Control Solenoid Electrical
B0202 Riley Two-point-six Hydraulic Oil Temperature Sensor Circuit High Input
B0202 Volkswagen Aac Rear Sounder Circuit Short to Vbatt
B0202 Alfa Romeo Stelvio Air Bag Crash Sensor #2 Ground Circuit Failure