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E46 M3 (2001-2006)

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  #1  
Old 02-06-2006, 01:30 PM
27rotax 27rotax is offline
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Location: Lawrenceville, NJ
 
Join Date: Sep 2005
Posts: 30
Mein Auto: '01 M3, '88 M3, '95 525i
O2 sensor and cat problems...

Hi all,
My car ('01 m3 w/72k miles) seems to be going through emissions components, all for cylinders #1-3. So far the O2 sensors once, the cat, and now it's giving a code for the O2 sensors cyl. 1-3 pre-cat, again. I'm thinking something upstream is causing the problems and am trying to guide the dealer a bit... the car is still under the cpo warranty, so I'd like to get this fixed while I still have it! I did read something about faulty ignition coils on the M54, but I'm not sure if that affected our motors as well. The coils are original to my car and the plug are new. Any thoughts? Thanks!
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  #2  
Old 02-09-2006, 08:32 PM
GregW in Oregon GregW in Oregon is offline
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Location: Lake Oswego, OR
 
Join Date: Jan 2002
Posts: 438
Mein Auto: '01 M3 Coupe; '06 ML350
Fault codes

Quote:
Originally Posted by 27rotax
Hi all,
My car ('01 m3 w/72k miles) seems to be going through emissions components, all for cylinders #1-3. So far the O2 sensors once, the cat, and now it's giving a code for the O2 sensors cyl. 1-3 pre-cat, again. I'm thinking something upstream is causing the problems and am trying to guide the dealer a bit... the car is still under the cpo warranty, so I'd like to get this fixed while I still have it! I did read something about faulty ignition coils on the M54, but I'm not sure if that affected our motors as well. The coils are original to my car and the plug are new. Any thoughts? Thanks!
The S54s have had frequent ignition coil problems. AFIK, though, your engine will hardly run when one or more go bad, due to deterioration of the insulation and them shorting out. Not sure if they could give the symptoms you're seeing.
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Last edited by GregW in Oregon; 02-10-2006 at 06:59 AM.
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  #3  
Old 02-09-2006, 09:55 PM
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ThatOneGuy ThatOneGuy is offline
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Location: SF Bay Area
 
Join Date: Nov 2005
Posts: 372
Mein Auto: 2006 M3 ZCP
There is a TSB/Recall on a lot of the ignition coils. If that's what's causing the problem, it should be covered. I've read quite a few threads about cat failures in E46 M3's. Some as early as 37K miles. In California smog equipment is covered well beyond the factory 4/50 by mandate. NJ may have similar laws.
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  #4  
Old 02-11-2006, 08:52 AM
27rotax 27rotax is offline
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Location: Lawrenceville, NJ
 
Join Date: Sep 2005
Posts: 30
Mein Auto: '01 M3, '88 M3, '95 525i
Thanks for the help guys.... I'm headed to the dealer today, so we'll see what they come up with. I agree that if a coil was shorting out there would be a bad miss, which isn't the case. The car runs fine. I didn't realize that the cats were a common problem, so thanks for the info. Hopefully if it happens again, it's still on their dime...$1800 for the cat.. ouch!
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