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Originally Posted by truck150
02's were oem and i replaced both of them. the cat was an after market cat but still obd II compliant. and no i dont have the code i never recieved it. the guy said that it was a cat failure but i changed all of the things that work with the cat so i am stuck now.
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Normally when you get a CAT convertor efficiency DTC error code it will trigger the SES light so if you can re-scan and post codes someone should be able to help you. The codes will help pinpoint the problem or get you in the right circuit. Although the sensors have been replaced it doesn't rule out the wiring and voltages both reference from the PCM and 02 sensor heater.
I have an aftermarket odb-ii compliant hi-flow CAT and never get a CAT efficiency error code but you never know about aftermarket CATs.