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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 08-12-2016, 09:41 AM
dki378 dki378 is offline
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Mein Auto: 2005 325xi
Thumbs up 0% Fuel Trim (long/short) with Misfire

Hi guys,

I've gone a pretty long stretch without issues but my luck looks to have run out. I am having a P0302 + P0304 misfire codes that come up on my scanner. To make things stranger, when I try to monitor sensors while driving, the long term and short term fuel trim come up with 0%. Does that mean that my fuel system is the issue? I just changed my fuel filter in the spring so I'm guessing my fuel pump may have crapped out. Has anyone seen this before?
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  #2  
Old 08-12-2016, 09:53 AM
dki378 dki378 is offline
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Just to clarify, the 0% fuel trim is a fixed 0... as in something is not registering correctly or reporting correctly.

After some googling... I guess it could be a bad 02 sensor or MAF sensor. I will try to see what those sensors come up with on my next drive.
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  #3  
Old 08-13-2016, 04:38 AM
dki378 dki378 is offline
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Does this make sense to anyone?
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  #4  
Old 08-13-2016, 06:02 AM
marcozandrini marcozandrini is offline
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Mein Auto:
Your car has wide band O2 sensors. What tool are you using to monitor the sensors? It may need to be told that the sensors are wide band.
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  #5  
Old 08-13-2016, 08:55 PM
dki378 dki378 is offline
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I've tried two different obd Bluetooth reader apps and they both say the same thing. I might need to borrow a real one from someone/someplace.
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Old 08-14-2016, 06:18 AM
marcozandrini marcozandrini is offline
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The program needs to be set up to read wide band sensors.
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  #7  
Old 08-15-2016, 04:30 AM
dki378 dki378 is offline
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http://forum.e46fanatics.com/showthread.php?t=1101203

Following these directions got me nowhere. It sounds simple enough but I can't seem to get it to work...
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Old 08-16-2016, 04:59 AM
dki378 dki378 is offline
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Can someone confirm if my 2005 325 xi does in fact that wide band o2 sensors? I've read differing statements online.... ie 03-05 are all wide band but I've also read 03-05 are wideband except if and M3 or and xi.
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Old 08-22-2016, 04:48 AM
dki378 dki378 is offline
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This is at idle now. The issue turned out to be two bad coil packs. Replaced all of then and now the misfire is gone. Do these numbers make sense at idle?
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  #10  
Old 08-22-2016, 12:00 PM
jcase jcase is offline
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Most of the time if the system detects a misfire it will set the fuel trims to 0 and ignore the O2 sensors because it knows they will be wrong. It goes into a default programed mode.
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  #11  
Old 08-23-2016, 07:33 AM
dki378 dki378 is offline
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Good to know. Thanks.
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