I have a 2002 Grand Am GT 3.4. Been through emissions 4 times now. Changed both bank 1 and Bank 2 O2 sensors, Injectors, EGR Valve, new plugs, and oil change and tune up. All is fine for about 100 miles then get the ODB PO135. Knowing it is not the sensor, since it is new. Colorado allows NO2 to be 1.5000, pulling a 1.8 at state emissions. I am out of ideas other than the dreaded CAT replacement. I see that the cause can be a fuse ( which there is not one ) or, an engine circuit in the master fuse box in the engine. Which I dont see or can locate. Am I just screwed and have to get a new CAT?
2002 g.a. Gt 3.4 po135 odb
- Thread starter PnkZepp
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CatSkinner
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I agree with Melsg5, if your cat was plugged that bad, you'd have a severe loss of power, particularly on acceleration. Also, I don't know which O2 sensors you've been buying, but I've heard that there are quite a few discount sensors that die very early. I don't know your budget, but it's worth paying a couple of extra bucks for the better ones.