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Old 08-18-2012, 12:35 AM   #1
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Exclamation E46 323Ci idle problem/error code help

Hey guys,

So i was driving home last night and i stopped at a set of lights and i noticed my car started to idle very rough i could feel the shaking. When i went to accelerate it felt like it just didnt want to go it was revving but wasnt accelerating like normal.

Anyway i scanned it for error codes this morning and got the following results:

202 Lambda Regulation Bank 1 Post Cat
203 Lambda Regulation Bank 2 Post cat
151 Lambda Post Cat Bank 2 Max Limit
154 Lambda Pre Cat Bank 2 Min Limit
241 Misfire Cyl 4
242 Misfire Cyl 5
243 Misfire Cyl 6

Im pretty new to the whole diagnostic thing so any help making sense of all this would be greatly appreciated. Would i be correct in assuming the O2 sensors are the cause of the misfire codes?? Pleaseee help!
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Old 08-18-2012, 01:23 AM   #2
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misfire could be a spark plugs, coil packs, might be MAF but with 3 misfire codes, maybe vac leak?

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Old 08-18-2012, 02:49 AM   #3
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thanks for the reply ye i thought it might be a vac leak but i wouldnt know how to test for it? any suggestions or am i better off just taking it to a mechanic?
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Old 08-19-2012, 01:40 AM   #4
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I think the lambda sensors are reacting to the misfires rather than causing them. Also the lambda sensors have very little (if any) influence when you are accelerating or moving the throttle.

Vacuum leaks is a good call but wouldn't all the plugs report problems? Depends where the leak is I guess. Soapy water 'painted' around the manifold will make the idle change when you get the right spot.

MAF, Fuel pump, fuel filter/regulator, DISA flap.

Last edited by Commando; 08-19-2012 at 01:42 AM.
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Old 08-19-2012, 05:11 PM   #5
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^ should add CPSs to that list
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Old 12-23-2012, 10:28 AM   #6
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I just had the problem with my 323CI... My idle was erratic, I had loss of power, I noticed I was burning a bit of oil... I replace the PCV valve + hoses + spark plugs... Fixed everything! At a shop parts and labour cost me 800... Hope this helps.
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