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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-14-2012, 07:50 PM   #1
flying330ci
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Join Date: Feb 2012
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2001 330ci P0155 O2 Sensor Question?

I just recently flushed my Antifreeze and put New back in, I brought it up to temp, opened the screw on top to release any air bubbles the closed it. Everything is full, tight and all good. After running it for a while my radiator light illuminated on the dashboard so I automatically thought the fluid was low. But it wasn't. So I decided to run the code and it popped up as a P0155 O2 Sensor Heater Circuit Malfunction(bank 2sensor 1). Can anyone tell me why and where I can find and fix this sensor or any ideas? Thanks so much!!!
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Old 06-24-2012, 02:02 PM   #2
trippmann
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its your oxygen sensor, bank 2 means the header closest to your fire wall which contains cylinders 4,5, and 6. sensor one is the pre catalyst sensor that will affect the power and driveability of the car. do a search of o2 sensor replacement and judge if your up to the job. 3/10 for difficulty in the diy department.
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