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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Code 2c9e -> Rough idle?



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      05-22-2013, 01:34 AM   #1
Ferruccio
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Code 2c9e -> Rough idle?

I am getting a code 2C9E which, I think, means one of the O2 sensors is bad. Is this right? What else could it be?

When the engine is cold on 91 octane, it has an extremely rough idle that settles itself out after about 1 minute.

I can't see this being because of the fuel pump or injectors, though. I got this problem right after getting a clutch install. One of the DP bolts had corroded and needed to be drilled out, which probably affected the sensor. I am getting the car taken in for the battery cable recall, so I will be able to find out
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      05-22-2013, 12:25 PM   #2
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I wasn't able to get any responses to my inquiry about this on other forums either. It must be a really unusual problem.
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      05-22-2013, 02:30 PM   #3
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I don't see that code listed on Vishu's site for DME fault codes...

http://www.vishnutuningforum.com/viewtopic.php?f=2&t=22

are you sure it isn't 29CE...a misfire in cylinder two?
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      05-22-2013, 07:14 PM   #4
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It's definitely 2c9e. Lambda probe heating behind catalytic converter.

It is not periodically thrown, but always there as a "check engine light" vs. an "engine malfunction"
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      05-26-2013, 07:12 PM   #5
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The mechanic localized it to the O2 sensor, so that is getting replaced, as well as all the intake ports getting the carbon buildup cleaned off. I will keep you all updated. I am without the car for memorial day weekend, though :S
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      02-25-2014, 12:30 PM   #6
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Seems I forgot to update. It was the O2 sensor that was responsible for what was going on.

Of course, it was a myriad of little problems like this that needed to get fixed in the subsequent year. In 2013, I replaced the spark plugs, some injectors, and ignition coils. Each replacement made things a little bit better. Right now, the biggest issue is the injectors.
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      02-25-2014, 09:23 PM   #7
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Which O2 specifically? front or rear pre-cat or post cat? and do you know how he diagnosed it to find which one is faulty?
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