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Any way to clear check engine light myself?

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Old Mar 30, 2004 | 04:50 PM
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CES99E55
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08 S8, 02 S2 M5, 00 S4, 99 E55
Any way to clear check engine light myself?
I changed out my mass air flow unit, do I need to go to the dealer and have them clear the code or can I do it myself somehow?
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Old Mar 31, 2004 | 12:08 AM
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W205 C300
Disconect the battery for 10 minutes or buy a Scan Tool that has a reset feature.
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Old Mar 31, 2004 | 12:12 AM
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Clearing the code is only half the process. You'll still have to reset the fuel trim adaptations, or the light will come right back on.
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Old Mar 31, 2004 | 12:28 AM
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Originally posted by mbtech208
Clearing the code is only half the process. You'll still have to reset the fuel trim adaptations, or the light will come right back on.
How do you accomplish that?
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Old Mar 31, 2004 | 12:56 AM
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You need the Mercedes SDS/DAS computer to do that. It might be worth just taking it to the dealer.
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Old Mar 31, 2004 | 12:58 AM
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The reason I asked is I threw a trim code that I cleared and it has not come back.

I am going to tune the MAF with a Split Second unit this weekend and I want to make sure I am running with the correct mapping as it stands.

I can't take this car to the dealer here...
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Old Mar 31, 2004 | 12:54 PM
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The code should reset itself. I changed the MAF on two E's and the light went out after a little driving.
Last edited by BlownV8; Mar 31, 2004 at 08:33 PM.
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Old Mar 31, 2004 | 01:46 PM
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CES99E55
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08 S8, 02 S2 M5, 00 S4, 99 E55
So I can just swap the old MAF with the new one and be on my way? I did this with my S4 and the check engine light did reset itself.
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Old Mar 31, 2004 | 08:34 PM
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Yep, just change and drive. You'll be fine.
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Old Apr 28, 2004 | 11:38 PM
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Does anyone have any contacts in the Cincinnati, OH Area to do this job? My CEL just turned on last week, then went off for 3 days & now its back on. Any help would be appreciated. Thanks.
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Old Apr 28, 2004 | 11:59 PM
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08 S8, 02 S2 M5, 00 S4, 99 E55
Sounds like the same thing that happened to me, most likely its your mass air flow sensor. Don't send it in to have it fixed it will only take you 15 minutes to do it yourself and its quite simple. If your car is under warranty then obviously have it done but if not save yourself some cash and do it yourself and after you sweap them out the light will clear itself. Good luck and give me a buzz if you have any questions 309-251-9096 Caesar.
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