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02 heater wire

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  • rs4pro3
    replied
    correct, it goes from the o2 heater relay to the sensor.

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  • Garageaholic
    replied
    oooooh i see, so the heater wire is going TO the oxygen sensor,, not FROM the oxygen sensor...

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  • rs4pro3
    replied
    The sensor has to be at a certain tempature to work effectively, the heater wire heats the sensor up when you first start the car, so the ecu gets a better signle from the sensor, vesus waiting for the exhuast gases to heat it up.

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  • Garageaholic
    started a topic 02 heater wire

    02 heater wire

    What does that heater wire do? how necessary is it? (4 wire 02 sensor version)
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