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      05-21-2013, 10:31 AM   #1
irish_tyrant
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Drives: 2008 BMW M3 E92
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How to replace charcoal (EVAP) fuel canister

Hey all,

I need some help finding and a how-to on replacing the charcoal canister.

I overfilled the gas tank the other day (from dead empty to full) and the car immediately started running rough. I put 40kms on it that day and the next morning got about 2 min from the house and it stared to run really rough. Then I got an "Engine Malfunction - Reduced Power" notification. I immediately took it home and drove my truck to work.

From doing some searching I believe I may have flooded the charcoal canister (the activated charcoal filter according to BMW) and I think that's whats throwing the codes.

The first code is "Lambda probe pump current synchronisation error before cat Bank 1" the rest are cylinder misfire codes.

I can't find much info on where the canister is or how to change it out, only that it's $300 from the dealership. I plan to do a full warning/DIY after I've sorted this out but if someone could point me in the right direction, much appreciated.

(Moved from "Wash, Wax, Detail, Cosmetic Maintenance & Repairs", could one of the moderators delete the thread in the "wash, wax..." section? Thanks,)
irish_tyrant is offline   Canada
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      05-26-2013, 12:49 AM   #2
irish_tyrant
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Drives: 2008 BMW M3 E92
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Location: Victoria, BC

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So I pulled the charcoal canister and there's not really much to check. I've talked to a few techs and they said that it may have been a bad batch of gas that fouled the o2 sensor. Has anyone had bad or dirty fuel plug up an oxygen sensor after only 45 kms? It runs rough on startup and then goes into limp mode after about 2 minutes. I'm going to pull the pre cat o2 sensor and torch the tip to see if I can clean it tomorrow.

Any advice or similar experience?
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