Quote:
Originally Posted by acousticrawk
well, i ran the codes at work. i got 3 o2 sensor codes. I've never known an 02 sensor to cause a rough or low idle though. nothing wrong with champion plugs from my experience in anything. they have been around forever and been making plugs for race cars for years.
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Makes perfect sense. The upstream sensors (before the cat) would be the ones that affect the engine operation. The downstream (after the cat) is simply there to verify the cat is functioning and shouldn't do anything besides set a code.