Oxygen Sensors - Bank 1, Bank 2 explained
Results 1 to 1 of 1
  1. #1
    Super Moderator
    NealP's Avatar
    Join Date
    Mar 2012
    Car Specs:
    2006 + 2007
    E90 325i M Sport + E87 120d
    2.5l + 2.0l
    Petrol + Diesel
    Thanked 1,553 Times in 1,057 Posts

    Donate Please click the
    image to support
    Click Here To Contribute To Our Site

    Oxygen Sensors - Bank 1, Bank 2 explained

    When you read codes, they sometimes come up with faults relating to O2 sensors. This may well point to 1 of 4 sensors on a 6cyl/8cyl car, so here is a diagram to explain the terms a little better.

    - Bank1 Sensor 1 and Bank2 Sensor 1 are the pre-cat sensors;
    - Bank1 Sensor 2 and Bank2 Sensor 2 are the post-cat or after cat sensors.

    -Addition by Ronnie-
    To add to this, if you do get a o2 sensor/lambda sensor fault code come up, you should first check for any unmetered air that may be entering the engine from split induction pipes, vacuum pipes or breather pipes, all air should travel past the air flow meter otherwise it will give you a running fault and can trigger a o2 sensor or MAF/MAP sensor fault code.

    o2 sensor HEATER fault codes though are more likely to be down to a failed o2 sensor, but a check of the wiring should be done first as well as a check for voltage on the heater wire.

  2. The Following 4 Users Say Thank You to NealP For This Useful Post:

    Diablo944 (29-07-2012),E36 lover (26-04-2012),Ferret (26-04-2012),Ronnie (20-12-2013)

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts