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      04-29-2013, 06:02 AM   #1
doughboy
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2C32: N54 Lambda probe faulty?

As above,

I've got a stuttering / boost cutting problem at higher revs, feels like a misfire but only the codes below:

2C32 Lambda probe infront of catalytic converter 2, trimming control
2C6A Lambda probe behind catalytic converter, muddled

Last week (I thought it was a misfire) it was stuttering and jerking when you applied a little more throttle from part throttle cruising at 70/80 on a dual carriageway.

Got home, expected misfire codes, but got just the bank 2 lambda code, changed the plugs that I had already bought, reset all adaptations and it was much better, no problems.

But got it good and hot and when going WOT in 3rd from low down got the stumble over 5k, and now the same lambda code. After that the boost was really reigned in, reset adaptations all ok again...

Am I correct that the pre-cat sensors are the main ones for engine running & AFR etc and the rear ones are just for emissions checking post CAT?

Or can the rear sensors effect the running too?

Any ideas

Picture of BT screen: (interesting it says these codes should give a warning light, but I have no dash warnings...)
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      04-29-2013, 07:01 AM   #2
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Remove the DPfix first would be my advice.

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      04-29-2013, 07:14 AM   #3
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Yes, I'd read a few threads about issues with the DPfix.

Even Terry's own advice is ditch it as it was never a long term solution.
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      04-29-2013, 07:17 AM   #4
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Given you have just replaced the Clutch/Flywheel could it be related to this?

I know that high RPM misfired have been caused by Flywheel problems on high HP cars.

Maybe see how it goes after you go back to OEM on Friday?
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      04-29-2013, 07:29 AM   #5
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Do you mean problems with SMFW or DMFW?

How bad do misfires have to get before they are logged by the DME? This problem sure feels like a misfire, but it's not being logged a such.

It also has an intial bad idle and definite misfire on start up, but it puts the idle up and it settles ok, but still no codes logged except this lambda one.

After changing the plugs, the stutter (more like boost drop than stutter, boost does drop down) is now only high revs, the midrange stutter has gone.

Woods are getting the bank 2 pre-cat lamda sensor ordered in for Friday just in case, but it's 150, so I don't want to put it on if its not that.
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      04-29-2013, 07:56 AM   #6
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Can't Woods get you the sensors cheaper? Bosch do them and they are the same as the OEM ones but in their own box. Part numbers are 17098 and 17099 for the pre cat ones.

I highly doubt it is due to the flywheel, DB has a brand new single mass one and when it did it on mine, the car went into limp mode.
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      04-29-2013, 08:29 AM   #7
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Just thought if the new FW isnt run in yet but going WOT at High RPM it may cause similar misfires to those experienced by High HP/TQ guys. It could be completely unrelated..

Is there a way to test the Lambda sensors?
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      04-29-2013, 10:37 AM   #8
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Quote:
Originally Posted by idnan View Post
Can't Woods get you the sensors cheaper? Bosch do them and they are the same as the OEM ones but in their own box. Part numbers are 17098 and 17099 for the pre cat ones.
Cheers Idnan, Woods didn't mention cheaper ones, I suppose it's easier for them to just get them from BMW.

They're on ebay for 110 + postage, which is a good saving.

But they're only $100 in the US!
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      05-02-2013, 03:14 PM   #9
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I removed the DPfix this afternoon and reset everything..

All hunky dory, no codes, starts beautifully, runs great, pulls smooth as butter WOT. In fact runs better than it has for a while

Just in time for Bedford trackday on sat..

Actually made the SPEC clutch feel great out on a hoon, but when hot it judders like a mother in town.
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