Our emissions expert has put together the following information about the P0191 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
The Power Train Control Module or PCM needs to know the fuel pressure at all times. This is so the PCM can effectively control the fuel injectors so they deliver the optimal amount of fuel into the engine's combustion chambers for maximum power and economy while maintaining the lowest tail pipe emissions.
Code P0191
indicates that the signal from the Fuel Rail Pressure Sensor and/or its circuit is sending erratic readings, indicating a fuel pressure condition that is abnormal.
I guess I can go to AutoZone and ask em what I can do? I have no Check Engine Light..
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