Logo

C3903 Engine Trouble Code

Meaning of C3903 engine trouble code is : C3903 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,000. Taking your car into a shop will cost you around $200 depending on the car. However, an oxygen sensor is easy to replace on many cars and is usually detailed in the owner's manual. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Regardless of how you approach it, you should get this fixed right away.

C3903 Possible Solution:

C3903 Engine

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

C3903 Code Meaning :

C 3 9 0 3
OBD-II Diagnostic Chassis (C) Trouble Code For Engine Ignition System Or Misfire Injector Circuit Malfunction - Cylinders Cold Start Injector 1 Malfunction Exhaust Gas Recirculation Sensor B Circuit High

Regarding the C3903 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter.

C3903 OBD-II Diagnostic Chassis (C) Trouble Code Description

C3903 engine trouble code is about Exhaust Gas Recirculation Sensor B Circuit High.

Reason For C3903 Code

The reason of C3903 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

C3903 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.