E-Class (W211) 2003-2009

"Check Engine" light just came out of nowhere

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Old 08-04-2008 | 03:00 AM
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b_rashed's Avatar
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From: Sacramento California
2007 S550 (S65 Package)
"Check Engine" light just came out of nowhere

hey guys i was at the drive thru and i look at my speedometer and my check engine light just pops on . the car so far drives fine but why did it come on. what could be a possibility. i dont wnt to take it to the dealer b/c well what theyre gonna do is charge me like a million dollars to just tell me whats wrong with it and then charge me about a billion to fix the problem and thats why i post on here. so please somebody help.
Old 08-04-2008 | 04:07 AM
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Could be anything, best thing is to have a diagnostic read out from the OBD socket. There should be an independant garage around that can do this for you for a lot cheaper than the dealer. Phone around.
Old 08-04-2008 | 12:00 PM
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Remember that "Check Engine" simply means that one or more of the emissions sensors is detecting higher than expected emissions. It could be almost anything. With what gas costs now, it pays to have it looked at.
Old 08-04-2008 | 12:05 PM
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was '03 E320 - now - '04 S4
It might be as simple as a loose gas cap
Old 08-04-2008 | 01:39 PM
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thanks guys, ima take it to a friend of mine that has a muffler place. he says he can plug it up and see what the code is.
Old 08-04-2008 | 03:32 PM
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Try sliver star motors on the corner of fair oaks and california, the owner is really cool he will take care of you.
Old 08-04-2008 | 09:32 PM
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If I was around you, I'd fix it for only a quarter million....
Old 08-04-2008 | 11:35 PM
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Yeah try your Gas cap.. It happened to me bfore..
Old 08-05-2008 | 12:30 AM
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yeah...only takes like a second to read the code...probably not a big deal, at least hopefully not .... like lig said...it could be a loose gas cap...make sure its tight...drive it around for a little, turn it on and off, etc...happend to my wagon a while back
goodluck
Old 08-06-2008 | 05:35 PM
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thanks guys for the help. i went to my buddy and he plugged it up and it came back as an emmission leak. i tightned the gas cap and it went off but came back asap. i turned the car off for a lil while and then when i turned it back on it was off and hasnt turned back on since. thanks
Old 08-06-2008 | 07:28 PM
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Originally Posted by lig
It might be as simple as a loose gas cap
My check engine light came on yesterday. When I stopped at the store, I took the gas cap off and put it back on and made sure it was on right. The check engine light hasn't been back on again (knock wood). I would recommend reseating the gas cap before taking it in.
Old 08-06-2008 | 08:24 PM
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I had the Check Engine light come on a few weeks ago. The air pump relay had shorted, causing it to run full time. This is the air pump at the top center of the engine that pushes air into the exhaust to help the catalyitic converters heat up for about 2 minutes on a cold engine.

When I finally arrived at the dealer, the pump smelled like it was going to cause an electrical fire.

If this ever happens to anyone else, you'll hear the air pump running "key on, engine off". Pull the front cover (top engine front) and unplug the electric air pump.
Old 08-07-2008 | 12:59 PM
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was '03 E320 - now - '04 S4
Glad to hear it was an easy fix for a couple of you guys.

A possible engine fire would be scary indeed. Yikes!
Old 08-07-2008 | 09:27 PM
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Originally Posted by GGM
My check engine light came on yesterday. When I stopped at the store, I took the gas cap off and put it back on and made sure it was on right. The check engine light hasn't been back on again (knock wood). I would recommend reseating the gas cap before taking it in.
Still hasn't come back on (still knocking wood).
Old 08-09-2008 | 09:03 PM
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From: Orlando, FL
2008 E350
Originally Posted by GGM
Still hasn't come back on (still knocking wood).
Came back on yesterday on my way home from work.

Took it to the dealer this morning (Saturday!) and got it back the same afternoon!

"Right exhaust camshaft adjuster solenoid intermittent faulty. Performed SDS short test. Fault code 0060 stored in M.E. controller. DTB-S-B-03.30/08f."

So much for the loose gas cap theory.

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