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· Registered
2000 RS Coupe
3,985 Posts
Discussion Starter · #1 ·
I just finished installing a pp6 in my car, then I cleared all the codes and now I am getting

P0420 agian.

So I went to auto zone and had them all cleared. Then I drove some and the CEL came back on.

So I had them pulled agian and I had

P0420 agian
P0171 agian

why is bank 1 running lean? could it be the pp6 tune for rallitek is bad? Is my front O2 bad and that is why I am getting these codes now? I thought the pp6 was supposed to stop the cat code from poping up? Also I have noticed that my eng is ?osilating?

Any help would be nice thanks.
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