Question about 1999 Chevrolet Malibu

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Sensor problem... I really need some help here... no one knows the answer...

My check engine light has been on for quite some time now. probably about 6 months. when the light first came on I had the code read and it came up as the o2 sensor. (the one before the cat converter). I changed the sensor and the light went out for a couple weeks. but then it came back and had the same code. I took the car to my regular mechanic and he said that code can be multiple things. he messed around with some wires on the map sensor and once again the light went out for a little bit, but it came back. I'm clueless and everyone else seems to be to. if you have ANY idea what the problem could be please help!

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  • kto23o Oct 02, 2008

    I have had the same issue with the O2 sensor. Replaced it twice and code came up again.

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I would replace the O2 sensor again,and it should be replaced under warranty,as most parts have at least a 1 year warranty.If the exact same code came back again,for the exact same O2 sensor,then the next step in the diagnostic route (every trouble code has a diagnostic route) is to ohms check the wires for that specific sensor between the sensor and PCM (Powertrain Control Module) for continuity.You are looking for any problems with the wires,or the connectors,involved in the circuit.If the sensor checks out,and the wires check out,then the only thing left is a problematic PCM,which might be able to be reflashed so that it is less sensitive,and less prone to set a "check engine" light and diagnostic trouble code.Reflashing is basically just reprogramming the vehicle's engine and trans computer/controller.Good luck,and t/y you for your service to our great nation.

Posted on Jul 16, 2008

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Posted on Jan 02, 2017

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