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Thread: F30 Oxygen sensor

  1. 02-16-2021, 05:31 PM #1
    F30n20
    F30n20 is offline Member
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    F30

    F30 Oxygen sensor

    Hello, i purchased a car that had downpipe installed, i took it out and installed original empty cat pipe. Im getting 14-15l/100km (allways on comfort and not crazy) and these fault codes. I got CEL once, but deleted it and didnt came back since.
    12B104 - Oxygen sensor heating before catalytic converter, activation: line disconnection
    12B304- Oxygen sensor heating after catalytic converter, activation: line disconnection
    180001 - Catalytic converter:Eficiency below limit value.
    My question is, do I have to change my O2 sensors, or previous owner didnt reprogram the car after installing downpipe and I have to reprogram second o2 sensor ? And could it be the reason im getting such a high fuel consumption? Any advice helps alot!
    Last edited by F30n20; 02-16-2021 at 05:36 PM.
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