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CEL comes on every 2 months

 
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Old 08-12-2011, 04:15 AM
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CEL comes on every 2 months

I've had my check engine light come on almost every 2 months already. It's always the same code too. P0420. I basically had my cat and both O2 sensors replaced on october. I'll reset the code and it'll go away for a while then come back. Catalytic converters basically new.

My assumption is the oil/rich fuel burning the engine does which leaves black soot on my rear bumper and trunk. It becomes really obvious since my cars white. You think it's time for a new engine/engine rebuild/new car? I figured 190,000km is about that time.. :( If not. Could it be anything else? Or something I should do to get rid/prevent it?
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Old 08-12-2011, 10:14 AM
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Re: CEL comes on every 2 months

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Originally Posted by andrewcjduong View Post
Or something I should do to get rid/prevent it?
You can do the spark plug non-fouler trick to the secondary O2 sensor like I suggested to you a couple months ago, or get an oem cat.
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Old 08-12-2011, 01:11 PM
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Re: CEL comes on every 2 months

Well I had the same issue with the OEM cat too which is why I replaced it.
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Old 08-12-2011, 05:43 PM
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Re: CEL comes on every 2 months

If it was the original cat you replaced, your mileage seems like it could be high enough that the original cat just went bad.
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