2002 325 Ti O2 sensor questions
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  1. #1
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    2002 325 Ti O2 sensor questions

    A couple of months back I got an engine management light up on the dash, it stayed for a day then cleared itself. It had just been on a run after only doing short journeys for a month and the battery had been low on charge as well. As a result I put it down to the change in driving and a near flat Batt. Doing the same run the other night made it pop up again. This time I stuck the OBD reader on it and came up with the following :- o2 sensor Heater circuit Bank 2 Sensor 2 / System too lean Bank 2

    I know that there is no guarantee that just because the car throws up a sensor issue that it is definitely the sensor, but in a drift in the right direction I am planning to replace the sensor. My problem now is that I dont know which side of the engine the 'Bank 2' refers to. Is it the drivers side of the car or the passenger side. Plus I have no idea how to identify which sensor is sensor 2. They never did a Haynes for the E46 325 Compact (or the other engine variants) so I am flying a bit blind.

    So, where am I looking guys? and do I need a sensor with the longer wire or the short version? I keep seeing Pre cat and post cat, but no idea which has the right lead or where to find the one I am wanting to replace.

  2. #2
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    some generic scanners i know for some reason only report 1 bank as lean, you need to scan it wiv bmw inpa software and make sure its not both banks (227 and 228 codes) cos its prolly a vacuum leak which is very common on these engines for throwing lean codes...

  3. #3
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    sounds fair enough, but just in case inpa does confirm or disprove the reading it would still be nice to know which bank is which and how to locate the correct sensor. even if its just so I know myself for later reference.

  4. #4
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    you can tell if its airleaks wiv inpa cos ya long term fuel trim data will be at a considerable +% figure indicating its running lean (too much air in exhaust)...

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    To me, it suggests the sensor is duff as he said "sensor Heater circuit Bank 2 Sensor 2 / System too lean Bank 2" which does suggest it's the sensor rather than an airleak. The heater doesn't work and it thinks it lean on the 1 sensor after the cat.

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    heaters rarely cause any sort of problems on lambda sensors i ve had and dicky post cat one on mine for 18 months that throws a code now and again..

    post cat heaters and lambdas are nowt to do wiv engine running control, merely cat efficiency data and initial purging control of the cat converters on restarts after a shutoff periods...

    thought you was takin some time out fezzer ya tosspot?
    Last edited by dailydoggy; 28-07-2012 at 20:03.

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  12. #8
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    thanks for the info guys, appreciated.

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