1991 318is O2 Sensor Relay

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  • 91318is
    Advanced Member
    • Aug 2013
    • 168

    #1

    1991 318is O2 Sensor Relay

    Which one is it? I know it is under the firewall but there are three there. I checked online and haven't been able to find anything. Any help would be greatly appreciated. Thank you!
  • roguetoaster
    R3V OG
    • Jan 2012
    • 7753

    #2
    IIRC the left on (looking from the front of the car) is O2 heater, middle is fuel pump, and right side is the DME relay.

    You can of course easily figure it out via process of elimination. One cuts the fuel pump, which you can hear not coming on, another (DME) prevents the car from starting at all, and the last one (O2 heater) only causes a CEL to show up, but allows the car to start.

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