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New DP Opinions Please

if you seafoam the car looking for exhaust leaks you should put new plugs and O2 in after.
 


No exhaust leak.

MAF is new.

Upstream o2 replaced and now it seems that the downstream is not mirroring the up. Still will spike with the up sometimes, but not always. Upstream o2 was fouled up significantly. Going to drive it a bit and see if the pcm is happy. If not then I will replace the downstream o2.

If its still acting up after that then I need to do the fouler?
 
It's a '97 car.

It doesn't give two ***ks about a rear o2 or not.

Just set the code to not report and go about your day.

Also: I've had a ZZP catted downpipe on my GXP. Just recently had my SLP's installed on it. Got it up in the air...cat was falling apart. No warranty either, and it has 14k~ on it. So, no cat later....car feels a million times better (yes a bit louder) and better MPG's.
 
Rear 02 has now been replaced. Still have to see if the code comes back. The old sensor was fouled and burnt.

The cat seemed to be solid.
 
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