Question about 2004 Chevrolet TrailBlazer
All those codes and such an easy fix. ALL of these codes point to your upstream 02 sensor. It's the one on the passenger side of the engine coming off the exhaust, very very easy to get to. Soak that puppy with PB Blaster then remove the electrical connector and remove and replace sensor. TRY to stay away from Bosch 02 sensors, have been known and reported problems with these. In my case, I didn't have a choice but to buy the Bosch, but I haven't had any problems with mine.
Hope this helps, look to get a tad more miles per gallon too.
Posted on May 27, 2011
Testimonial: "Good answer and really appreciate the help. Also was told a PCM recalibration may be needed. Thanks"
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Posted on Jan 02, 2017
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