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Discussion Starter · #1 ·
So i recently put a catdelete downpipe in my car which made the CEL turn on, but i put the stock cat back on last night and reset the ecu. The CEL comes back on after a couple miles with a strong burning fuel. Anyone have any ideas what the problem is?
 

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What is the code you are getting? If it's something about catalyst efficiency, then it's likely either your cat itself, or the down stream O2 sensor.

If it a code for being rich/lean, then it's either the primary O2 sensor (before the cat) or the car is actually rich/lean. Then again, it could be something completely different. Check all other wiring, sensors, plugs, etc. and make sure nothing got knocked loose or damaged.
 

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not to hijack or anything, but if your running lean and its from the primary O2 sensor, then will spacing the sensor or a defouler help?
 
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