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CEL light came on today

 
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Old 08-17-2009, 02:57 PM
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CEL light came on today

long story short i was on my way to qz blvd wen the check engine light came on. i ran my obd2 scanner an it said it was code 0420. i know thats the cat-coverters oxi-sensor. im wonderin is there any way of fixin it without takin off the oxi-sensor from the cat. like cud i jus put some carbon cleaner and that mite work? or gas treatment?
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Old 08-17-2009, 06:22 PM
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Re: CEL light came on today

run a resistor to tell the ECU no CEL's to come up on the dash agian
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Old 08-17-2009, 07:02 PM
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Re: CEL light came on today

your gonna run rich and get terrible gas mileage if u dont fix it...but if that resistor works and the cel turns off there your ecu will give correct mixtures again
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Old 08-18-2009, 12:38 AM
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Re: CEL light came on today

Well if you have an old cat you might be on the road to it failing, a failed cat could clog up and really be a pain (been down that road) so just a heads up about that but if you just wanna hide the code you could to the o2 defouler trick and keep the cel at bay (link to diy http://www.preludepower.com/forums/s...d.php?t=267252 ) Oh and the code is for the secondary o2 sensor so it won't make you run hella rich like having a problem with the primary o2 sensor (been down that road too)
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Old 08-18-2009, 11:22 AM
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Re: CEL light came on today

That code isn't for the secondary o2 sensor necessarily. Code 420 actually says that the cat is performing below threshold. It could be the secondary o2 sensor, but if your cat is old or you have a "high-flow" cat this code can come up.

This just happened to me, and I did the defouler mod, and so far no more CEL
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Old 08-18-2009, 12:31 PM
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Re: CEL light came on today

thanx for the help guys. i put in the order for a whole new exhaust an cat an o2 sensors. i dont want anymore headache, cuz i gotta take it for gas station inspection on thursday
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Old 08-18-2009, 04:49 PM
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Re: CEL light came on today

Cool. What exhaust you get? Sounds like you did a little ovekill on the stuff you ordered, but it'll be good to have new o2 sensors and a cat.
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Old 08-18-2009, 09:24 PM
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Re: CEL light came on today

im puttin on a pace setter exhaust from cat back, it has 2.5in pipes an dual tip
i have to get this stuff done b4 thursday cuz i have inspection then.
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Old 08-24-2009, 02:44 PM
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Re: CEL light came on today

hey maybe yal can help me, My CEL came on i went to advance to get it check out he said it was the Air to fuel ratio, i kinda know the guy so he erased it it went away and it hasnt came back on yet, so is there still a problem or not
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