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how to test a 02 sensor?

Discussion in 'Land Rover Freelander' started by griff2, May 15, 2015.

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  1. griff2

    griff2 Active Member

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    hi all

    anyone no how to test a 02sensor? if ohms what should it read? and done hot or cold?

    cheers
    griff
     
  2. Nodge68

    Nodge68 Well-Known Member

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    Yes its possible to test an O2 sensor with a DMM. However it is also very easy to damage the O2 sensor is you don't have the meter on the correct setting. Basically you need to test the resistance of the O2 heater. To do this the meter applies a small voltage, measuring what comes back. However the O2 cell must be tested with the meter on Volts, NOT Ohms. If you test the O2 cell with the meter on Ohms, the O2 cell will be destroyed.

    There are several videos on YouTube showing what you need to do ;)
     
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