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      12-12-2008, 07:51 PM   #1
sirmalloc
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Exclamation SES light and limp mode

I was out driving tonight and my SES light came on and the engine feels like it went into limp mode - very choppy, like it's only running on 3 cylinders. I kept the revs down and drove it home. Since it's the weekend my dealer can't see me until Monday. Without having a code scanner, does anyone know what typically causes this? My last fillup was about 65 miles ago, 93 octane...I would think if it's the gas I would have noticed it sooner.

I've turned the car off and started it again a few times and the light is either there when the car is started, or returns within about 10 seconds. Is there any easy way to do a reset of the ECU and see if it returns? Anyone else had this happen?
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      12-13-2008, 07:47 AM   #2
DerekSelmanRacing
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Why would you want to reset the light if your car is obviously not running properly. The light isn't the problem; the light is an indicator that a problem exists.
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      12-13-2008, 11:41 AM   #3
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Quote:
Originally Posted by sirmalloc View Post
I was out driving tonight and my SES light came on and the engine feels like it went into limp mode - very choppy, like it's only running on 3 cylinders. I kept the revs down and drove it home. Since it's the weekend my dealer can't see me until Monday. Without having a code scanner, does anyone know what typically causes this? My last fillup was about 65 miles ago, 93 octane...I would think if it's the gas I would have noticed it sooner.

I've turned the car off and started it again a few times and the light is either there when the car is started, or returns within about 10 seconds. Is there any easy way to do a reset of the ECU and see if it returns? Anyone else had this happen?
Sounds like a misfire, take it to the dealer and have them check it for codes. Once the figure out what cylinder is the problem have 'em check the coil packs/spark plugs.
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      12-13-2008, 05:01 PM   #4
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Quote:
Originally Posted by Dammmittt View Post
Sounds like a misfire, take it to the dealer and have them check it for codes. Once the figure out what cylinder is the problem have 'em check the coil packs/spark plugs.
Thanks....that seems to be the most common response I've found searching around for others having this issue. My friend is bringing over his OBD-II scanner tomorrow to check the codes...would a misfire show up on a generic OBD-II scan?

I think this is what torture feels like. Driving the M for 7 days and then having to go a whole weekend without being able to touch it.
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      12-14-2008, 03:23 PM   #5
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Misfire codes should show up on a generic OBD-II scan.
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      12-15-2008, 10:41 AM   #6
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Took it to the dealer this morning and was out in less than 2 hours, including a wash. Turned out to be a bad coil pack on one of the cylinders. Glad this turned up now and not on the 1200 mile roadtrip I'm about to take over Christmas.
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