anyone knows why my check engine light on a couple of days and today it stays on all the time eventhough i reset the battery. u think something wrong w/ MAF or O2 sensor.Usually w/e part in O2 usually need to chnge. Is heard some noise from the bottom i think the catalytic has crack do u think it will affect those sensor thats why the cel in on.

Do you think a crack from catalytic will cause failure to sensor. My lights stayed on even i reset the battery. It was a couple of days my light warned and today again. I feel the idle was different .the RpM goes up right away even i accellerate the gas moderately. and when i check my oil now is dark w/e not usually the color. Is it because i ran the car even the warning is on.Do i need to change my MAF? If O2 sensor w/e one normally die right away..Pls...i need advice . I already repaired this car twice and got advice from this column it saved me a lot of money. I already change the CPS and brake sensor.

Autozone, Advanced Auto Parts, and other auto parts shop will pull the code for you for free, hoping to sell you parts. They will reset the light as well.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport

Find out what the codes are, i.e. have somebody retrieve them from the computers memory.
That should give you all the clues you need to resolve the problem.

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2007 C 230 Sport.

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No such luck in Canada.
As far as I know.

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2007 C 230 Sport.

Canadian Tire, eh?

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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!

Also known as " Newfie Speed & Sport ".
You know it!

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2007 C 230 Sport.