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  • 0patience 06/05/09 8:30 pm PST

    P0155 - 2/1 O2 SENSOR HEATER FAILURE
    The first oxygen sensor in cylinder bank #2 is numbered O2 Sensor 2/1.
    So, to simplify it's location, bank #2 is the side of the #2 cylinder or in the case of your vehicle, passenger side.
    Sensor #1, is the O2 sensor forward of the catalytic converter.

    Check ALL fuses and wiring to the O2 sensors. Make sure the connectors are good and not damaged.


    POSSIBLE CAUSES
    Open fuse
    O2 sensor heater feed circuit open
    O2 sensor heater ground circuit open
    O2 sensor relay
    Fused B+ output circuit open
    O2 sensor heater relay output circuit open
    Short to ground between relay and fuse
    Wiring harness intermittent problem
    O2 sensor

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