R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

"Check Engine" light came on - then went off

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Old 04-12-2010, 10:20 PM
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2011 R350 BlueTec
"Check Engine" light came on - then went off

I have an 08 R320 with 60,000 miles on it.

About 2 weeks ago my "Check Engine" light came on. All fluids were okay and the car ran great.

I called the service manager and he stated that light comes on mostly because of emission sensors. He stated there are 18 of them and bring it in my next time when passing through.

Today the light came on with start up, but never stayed on.

Has this happened to anyone else?
Old 04-13-2010, 02:53 PM
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2006 e55, 2008 r350, 1998 lexus es300
this has happened to me many times. advisor always said it was sensors being too sensitive. no problems with the car.
Old 04-15-2010, 04:40 PM
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Mercedes R 320 CDI Sport 4Matic
Originally Posted by Ted Flynn
I have an 08 R320 with 60,000 miles on it.

About 2 weeks ago my "Check Engine" light came on. All fluids were okay and the car ran great.

I called the service manager and he stated that light comes on mostly because of emission sensors. He stated there are 18 of them and bring it in my next time when passing through.

Today the light came on with start up, but never stayed on.

Has this happened to anyone else?
after you fill up the tank with fuel make sure to hear that cup click a few times. tank air presure can switch check engine light on and off.
Old 04-22-2010, 07:14 PM
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2011 R350 BlueTec
Well, after a new tank of fuel & "clicking" the cap a few times, the light has stayed off.

Little disappointed in the dealer for for saying the car reported a bad fuel rail sensor and it should be replaced. They should inform people of these potential fixes. (What a nice world that would be, huh?)

Needless to say, thanks for the help. Your advice actually saved me some money.
Old 05-03-2010, 08:29 PM
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r class 350
This happened to us with 06 R350 while on road trip south this past winter. As we were traveling we didn't want any problems so made an appointment with nearest MB dealer in Fla and it turned out to be just that...fuel tank lid. It couldn't work out better as this dealer had a cafe where you could order whatever you wanted for breakfast lol so we had a free breakfast and free car wash. We've had donuts, etc but never a full breakfast at MB dealers.

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