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Discussion Starter · #1 ·
Few weeks ago while cruisin at 40, check engine came on..my friends shop used scannee and o2 upstream was causing it...replaced both upstream with bosch. 1 week later same crap..I have noticed the exhaust to smell a little rich lately..won't have a diablo till after xmas.right now I have borla t, and a stock tune. If the engine is running rich, would this cause o2 sensors to fail? And would canned tune or custom tune in near future solve this..its a 2007
 
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