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My guess is on the o2 quality
Everything in my car is 100% stock or at least OE style. Thanks for letting me know that the engine is not running lean as I was a little concerned about driving it like this. I have already ordered another one from Ebay for $100 (hoping it is better quality this time). Once it arrives I'll test it for another two weeks to see if it's free of CELs.
Alternatively, I could put in my older "lazy" o2 sensor that doesn't ever go into lean burn mode. But I'm in love with lean burn, especially now that I finally got the car to get the promised high mpgs that you guys are getting.
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