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U3903 Engine Trouble Code

Meaning of U3903 engine trouble code is a kind of network trouble code and U3903 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,200. Taking your car into a shop will cost you around $210 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.

U3903 Fault Symptoms :

Check engine light comes on
Engine stalling or misfiring
Engine performance issues
Car not starting

If one of these reasons for U3903 code is occuring now you should check U3903 repair processes.
Now don't ask yourself; What should you do with U3903 code ?
The solution is here :

U3903 Possible Solution:

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.

U3903 Code Meaning :

U	3	9	0	3
OBD-II Diagnostic Network (U) 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 U3903 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.

U3903 OBD-II Diagnostic Network (U) Trouble Code Description

U3903 engine trouble code is about Exhaust Gas Recirculation Sensor B Circuit High.

Main reason For U3903 Code

The reason of U3903 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

U3903 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.

	Example: 0140