E-Class (W211) 2003-2009

How many restarts to reset check engine light?

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Old Jul 28, 2007 | 10:14 PM
  #1  
xraymd's Avatar
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2008 335 vert, 2004 MDX
How many restarts to reset check engine light?

No, it's not a parody of the Tootsie Pop commercial.

3 times I've had my check engine light come on in 2+ years. Each time the dealership says the code indicated a loose gas cap and they've cleared it. I've been told after a number of restarts the CEL would turn off assuming the gas cap is on securely. Well, the light is on again and has been for a month. Anybody know roughly how many restarts it takes to turn off the CEL?

Never had this problem before with other cars. Previously I blamed my wife for not tightening the cap all the way. But this time it must be me because she hasn't driven it for a couple of months.
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Old Jul 29, 2007 | 06:59 PM
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How can you be certain it is the same problem? Bring the vehicle in and if it is found to be the same problem suggest that they replace the gas cap.
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Old Jul 29, 2007 | 07:44 PM
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Computer holds about 60 start stop trips, turning the car on and off wont clear it you would have to drive for a while between each one..


Just disconnect the battery for half an hour and try that. But most of the time with the check engine light caused by the gas tank it went away after you opened the gas cap and put it back on.


Wait I take that back, the E class has 2 batts and it would take a while to figure out how to unhook the front one...

Best bet is to fill up the car a little more then wiggle the nozzle around to hold that gas flap down so the pressure comes out.

Usually in AZ we have this happen all the time but the E classes it has never happen on used to just happen on our old S class.

Last edited by AndrewAZ; Jul 29, 2007 at 07:47 PM.
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Old Jul 30, 2007 | 04:03 PM
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Originally Posted by konigstiger
How can you be certain it is the same problem? Bring the vehicle in and if it is found to be the same problem suggest that they replace the gas cap.
Experience I guess. Last time it came on I ignored it for about 3 weeks until I got a SRS warning and took it in. I'd prefer to avoid the dealership as it's a pain to get in, get my car looked at, etc. etc. The guys at my dealership are not the sharpest you'll run into

Andrew - Thanks for the idea but sounds like more trouble than it's worth (even more trouble than the dealership). I'll give it a couple more weeks and take it in then if it doesn't go off.
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Old Jul 30, 2007 | 05:53 PM
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Originally Posted by xraymd
The guys at my dealership are not the sharpest you'll run into
If it does turn out to be the same gas cap code it is documented several times that resetting did not solve it therefore, the cap should be replaced (most likely a faulty sealing ring) under warranty.
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Old Jul 30, 2007 | 10:11 PM
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Thanks. Next time I go in, I'll give it a try.
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Old Jul 30, 2007 | 11:47 PM
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I had that and it turned out my gas tank was leaking at the top, they said it was very common
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Old Jul 31, 2007 | 05:57 PM
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