Question about 2002 Cadillac Deville

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My 02 deville just had 3 different converters installed because check engine still reads catylist error bank one what do I do now?

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If a new converter does not fix it, it seems obvious that the O2 sensor that SET the code in the first place may be defective (or connector or the harness)- the converter has to 'light off' (get hot enough) for the O2 sensor to see that it is doing it's job-if it cannot see that, you either have other engine issues or you Bank 2 sensor is too old/coated with lots of miles on it to react properly or the heater circuit or harness/connector is bad.

Posted on Apr 04, 2011

Testimonial: " Thanks I was kinda figuring that would be my next step was to chck o2 sensors. The thing is the code tells me upstream n theres two there"


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