how to test an o2/lambda sensor
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  1. #1
    Member ilek300's Avatar
    Join Date
    Mar 2003

    how to test an o2/lambda sensor

    hey all,
    i kind of have reason to suspect mine has died, what are the symptoms of this normally? its in a 205gti s2, i have 12V going to the heater coil, the plug however when i pulled it apart was full of coolant! could that have fried something. i dont know how to test the single pronged plug to check if the sensor is good or bad? thanks

    <small>[ 27 June 2003, 11:18 PM: Message edited by: ilek300 ]</small>


  2. #2
    Fellow Frogger! AlsPug504's Avatar
    Join Date
    Jul 2002
    One thought is, if you or your mate has another car with an o2 sensor on it and tuned you could place the suspect o2 sensor on your mate exhaust and compare your O2 readings with your mates o2 readings.

    Do that at Idle when engine and sensor is hot. or in closed loop That way you can be sure that it should read 0.5 volts.


    <small>[ 29 June 2003, 05:05 PM: Message edited by: AlsPug504 ]</small>

  3. #3
    1000+ Posts Pugnut403's Avatar
    Join Date
    Mar 2003
    They need replacing every now and then anyway, so why not keep a spare, and when you suspect it may be going off, try the new one.
    Pugs Rule!

    403, now sold
    404, project
    2010 Mitsubishi i MiEV electric car

  4. #4
    1000+ Posts PeterT's Avatar
    Join Date
    Jul 2000
    Castle Hill, Sydney
    Connect a multimeter to pin 20 on the ECU and earth. Voltage should vary from 0.6 to 0.9V depending on load.
    idle - approx. 0.9V
    full load/WOT - 0.8 - 0.9V
    cruise - 0.6V
    over run - <0.6V
    ie under most conditions it should be in the range 0.6 - 0.9V.

    '92 205 Mi16
    '90 Mi16x4

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