Question about 2003 Chevrolet Monte Carlo

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Check engine light on.

Took it to the local auto parts store they checked codes but only stated that it was the rear bank but, didn't know of what. So I changed all the wires, plugs and the Ignition Coils light went out for a few days then came back on. A friend suggested that I replace the fuel injectors and/or the O2 sensors. Any other suggestions?

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Before replacing all those expensive parts---should hve it scanned by a professional shop. using the generic OBD scanners can give false info sometimes. once you get that code that will be more helpful. i have seen on the gm products especially the newer ones that 1--the upstream o2 sensor failure or 2 --- egr valve issues---let me know what you find out, then ill have a better idea on how to help you further

Posted on Jun 29, 2009


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