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#1
11-24-2006, 12:08 AM
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HELP! MAF replaced, but Check Engine Light still ON!
Hello, I have 2002 S500.
I replaced the MAF.. and recovered a lot of power. I could not believe how much torque I got by replacing this sensor. anyways, about 3 days later......... Check Engine Light came on. I do not have a code scanner. I might buy one for myself. I don't think it is the gas- I checked the gas cap, but it was already tight. I did the gas cap again, but no luck even after 5 ignitions over 2 days. Now, I am guessing if this could be related to O2 sensors. Any suggestions? one more thing, when you remove the MAF sensor assembly, there is rubber notches on the rubber o-ring for sealing between 90 degree bent tube. This rubber is old, so it is pretty hard- I was not able to put the notches into the notch sockets on the 90 degree bent tube. could this let some unfiltered air to flow into the intake and trigger the engine check light?.. 
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#2
11-24-2006, 01:35 AM
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You are right! The ECL comes on when I drive.
Well, I will get a code scanner on tomorrow, then fix the seal around the MAF also. I'll see what codes I get out of the scanner.. Thanks for your help. Any other suggestions, guys?
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#3
11-24-2006, 08:48 AM
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you also need to reset the mixture adaptations after replacing the air mass
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#4
11-24-2006, 04:34 PM
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Yeah you are shot gunning it with pricy parts. Have a MB dealer scan the codes, $100 at mine and then you will know the problem. Fix it and let them reset the adaption values.
The dealers use the good scanners, not the dinky ones diy's buy.
__________________
1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#5
11-24-2006, 05:36 PM
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Although, a $50 scanner, patience and help of this forum can result in many faults being easily resolved if you are inclined to DIY.
 The scanner is an absolutley necessary tool for anything 96 and newer.
__________________
Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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