C1202 Diagnostic Trouble Code

C1202 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 C1202 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. 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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C1202 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 C1202.

Fortunately, C1202 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1202 Trouble Code For Specific Cars

C1202 Mercedes-benz 540 Air Bag Safing Sensor Output Circuit Short To Ground
C1202 Lotus Emme Traction Control Input Signal Range/Performance
C1202 Jaguar C-type Seat Driver Forward Circuit Open
C1202 Mazda 929 Transmission Transfer Case Contact Plate Power Circuit Failure
C1202 Nissan Terrano Ii Cylinder #2 High To Low Side Open
C1202 Rolls-royce Silver Cloud IAC Monitor Disabled by PSP Switch Failed On
C1202 Jensen Cv8 Seat Driver Recline Forward Switch Circuit Open