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Old 05-29-2006, 09:14 AM
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Join Date: Mar 2006
Posts: 8
mass air flow meter

own a 98 c280 from the start. cel light came on at 20k afrer 4 years, did not drive much. guilty of neglect for almost 2 yrs. finally did diagnostics test at
40k the other day, faulty MAF from codes. could this be possible since car shows no symptoms of this. car since new drove like a dream and still does. gas mileage is at 20 /25 city/highway. idle fine, no hesitation. pick up fine. any opinions?

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Old 05-29-2006, 10:48 AM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
It's still running fine thanks to the adaptation system in the FI. Your system is probably not at max adaptation yet, but has exceeded the threshold to trigger the CEL. Sometime in the near future the AMM will degrade to the point where the adaptation cannot fully compensate and you will experience running problems.
John Shellenberg
1998 C230 "Black Betty" 240K
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Old 06-02-2006, 01:44 PM
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Join Date: Mar 2006
Posts: 8

Thanks. I will replace. Where is the MAF located on my c280 and do the codes have to be reset once MAF is replaced or will it reset itself after driving a while.
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Old 06-02-2006, 04:51 PM
Ali Al-Chalabi's Avatar
Senior Member
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
It's on the intake plumbing. A couple of drive cycles with a new meter should reset the check engine light.

Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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