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Originally Posted by pbonsalb
If it is a post cat 02 then it will have no effect on performance. If it is a pre cat 02, it likely would have an effect on performance. Pull the code(s) to find out which 02 and what the CEL is for.
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P2629
o2 sensor pumping current trim circuit/open.
P0491
Secondary air injection system insufficient.
I cleared them twice and the same ones came back.
Like Mike said, its probably a bad o2, but how can I tell which one based on these codes? Does "Secondary" refer to post cat? Is there a different part number for post and pre o2? Im going to call my SA tomorrow to order the part, he can get it to me at his cost. Im assuming changing an o2 should be pretty simple.