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Could running 92 octane have anything to do with a o2 CEL?

I'm hesitant on installing the headers.... those bolts on that down pipe are a mess. Duren03msp I see your from bunsville. I live in Brooklyn park!

Oh man, let's just say I tried to make my own keys. And I ended completely destroying the stock stero. Bent s***, broke s***, pried on things I shouldn't have. I recommen buying the keys.

I'll try and add a second fouler to bottom o2 tonight. There's only one on there now. By ticking the sensor and making the richness run where it thinks it should, in the long run would that cause build up in the cat? All in all cats need to go.

Thanks for your reply, Just got back from oreilly's and yup its the p0421 code. I looked on eBay for some headers the obx ones are about 200. Are there any review or opions on the 80-100 dollar ones? I picked up some of the foulers. Should I install them on the 1st o2 sensor for now. I looked...

As stated in title. Need complete light. Passenger side. new or used. please be working though. Thanks!

Hey Mazda247, Im a new owner of a 2003 Mazda Protege. My check engine light came on after putting on 300 miles on the car. -_- I am already certain its throwing me a o2 sensor fault. Here in the state of Minnesota I have no emissions so I would like to let this baby "breath." I have searched...