C0103 Diagnostic Trouble Code

C0103 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 C0103 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
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.
Dirty air cleaner element Damaged DPF

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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. 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.

Process Tips

Diagnostic trouble code C0103 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 C0103.

Fortunately, C0103 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0103 Trouble Code For Specific Cars

C0103 Daimler Conquest Head Rest Switch Circuit Failure
C0103 Renault Clio 4 Gear Shift Module Communication Circuit Low
C0103 Kia Avella Seat Rear Up/Down Potentiometer Feedback Circuit Short To Battery
C0103 Chevrolet Deville Driver's / Passenger's Door Ajar Output Circuit Short to Battery
C0103 Jaguar 420 Seat Driver Backward Circuit Short To Ground
C0103 Lancia Ypsilon Steering Angle Sensor Circuit Failure
C0103 Peugeot Rc Engine Coolant Temperature Signal Missing/Fault