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O2 sensors in 2002 Escalade


arejaye5000

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Hi guys, check engine light has been on, truck running REAL rough at idle and off the start. Pulled a bank 1 sensor 1 code. And also 0300 random misfire code. Would the o2 sensor be causing a rough idle and make it run rough off the start? And would it have anything to to do with the misfire code or is that a whole other problem? Iv changed the plugs(gapped at .60), wires, and coils and cleaned the throttle body. Still running rough. Thanks!

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02 sensors run in open loop (Feedback is given to the PCM, but it does not change the performance of the engine) until the engine has warmed up to operating temp. My guess would be that there is an issue with that bank of cylinders. I would make sure the fuel injectors are working right, and the ignition system is doing its job. I would also see if there is a vacuum leak on the bank of the accused 02 sensor. A misfire (ignition, fuel, improper air ratio) could cause an 02 code.

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