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  1. #1
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    DME Code 2C9E after clutch install

    Hi. I had my clutch and flywheel replaced (Spec Stage 2+ with OEM Dual Mass Flywheel), and I notice that now I get a regular 2C9E DME code. A bolt was corroded on one of the downpipes and had to be drilled out, and replaced with a new bolt. Could this have upset one of the O2 sensors, maybe dislodged it?

    The clutch and flywheel combination, by the way, is great. I was preparing for the worst but this clutch feels so stock-like that someone could have swapped this without telling me and I would have only vaguely noticed a difference. Now to drive for 500 miles like a granny in stop and go traffic. :@

  2. #2
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    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  3. #3
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    2C9E(Lambda probe heating behind catalytic converter)?

  4. #4
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    I'll probably just get the O2 sensors checked out when the car's in the shop for the battery terminal recall repair. That won't happen until the 23rd though. I will try to keep you updated.

  5. #5
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    You most likely damaged the 02 or its heating element. The rear 02s are sensitive to harsh movement or sudden shocks. I would know because on two cars i had the studs snap. I heated the downpipe up with a torch and hammered the broken stud out. After the dp install i had 02 codes come up immediatley.. and they are not cheap :-(

  6. #6
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    Erf, yeah, that makes sense. How much does driving with a faulty/broken O2 sensor hurt the engine? I know it manages air/fuel ratios a bit, but I am not sure how critical it is. I'm definitely getting it replaced, though. It will just be in another two weeks.

  7. #7
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    As long as the damaged sensor is one of the secondary sensors as @Flinchy indicated above, there should be no problem driving with a bad sensor.

  8. #8
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    Yeah, it is specifically that code. Thanks for the info.

  9. #9
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    I am wondering, is this a side effect of having this sensor broken? In low rpm on a high gear, applying the throttle rapidly causes a shudder in the car which sorts itself out in about 1 second. It doesn't do this in 5th gear or lower gears as far as I could see.

  10. #10
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    I got the O2 sensor replaced and all the fault codes and misfires went away. I am running a flex fuel map with a sensor and 100% E85 is ridiculous. I've been running 50% for a while, just because I wanted to wear in the clutch properly. With 100%, there is no slip, and the car just climbs through the gears so fast. First gear is gone in a flash.

    So far, so good! It looks like this was the O2 sensor all along.

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