C1952 Diagnostic Trouble Code

C1952 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 C1952 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.

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.

Process Tips

Diagnostic trouble code C1952 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 C1952.

Fortunately, C1952 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1952 Trouble Code For Specific Cars

C1952 Innocenti Small SCP (J1850) Invalid or Missing Data for Interior Lamps
C1952 Nissan Largo Column Reach Feedback Potentiometer Circuit Failure
C1952 Lincoln Mark Throttle Position Sensor In Range But Higher Than Expected
C1952 Triumph Bonneville T100 Passenger's Seat Occupied Switch Circuit Short to Ground
C1952 Renault Scenic 4 High Mount Stop Lamp Circuit Failure
C1952 Vector Rd PRNDL Reverse Input Short To Battery
C1952 Jaguar Xk-8 Seat Driver Occupied Switch Circuit Short To Ground