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25 Responses to “Auto Repair: Oxygen Sensors – Testing and Replacing (1 of 2)”

  1. st2hallock says:

    this is so cool … its like the diag classes my grampa would have taken.(LOL) Thank god for obd2 and CAN. I think the funniest part is when he says “some o2 sensors have more than one wire” and “some have a little heater” how long has it been since vehicles weren’t equiped with HO2S(heated oxygen sensors)

  2. rwdplz1 says:

    The great thing about these videos, is they’re the same age as my car: 84 Pontiac Fiero. A lof of the videos use the same sensors, etc.

    The early fuel injected cars are a LOT easier to work on than the 96+ OBD2 cars.

  3. MrKhalio says:

    why there is no any power supply to the sensor

  4. skitch says:

    because they use heat to change the resistance and the ECU checks that resistance against spec values and adjusts accordingly. A lean A/F ratio burns hotter than a Rich A/F mixture.

  5. souseman says:

    the sensor produces energy from heat

  6. aikaha says:

    Where is this voltage being generated? where is there power source? They are leaving something out.

  7. mexskal says:

    well the o2 sensor is a generator of its own signal dc, on modern cars the pcm send voltage to the heater of the o2 to warm it up, to be more efficient also the voltage send returns to the pcm and compares them

  8. Ozbassman says:

    top vid NED FLADERS!!!!!

  9. murto30 says:

    Very good tips, well done.

  10. doromanekia says:

    tried this worked out well thanks

  11. asianguy207 says:

    from the meter…

  12. xueyongchen1001 says:


  13. echaru says:

    Too bad I don’t have blow torch around in my house.

  14. ShunKamiko says:

    You can actually also test it while it’s in the vehicle, with it running after the engine has been warmed up. be careful to not burn yourself, though

  15. thenightwolf80 says:

    I understand its value range and how to test. But P0420. Upstream read 2.9V and Downstream read .31V.. Snap TP and O2 Up read 5.1V and Down remained constant. no air leak from engine throughout exhaust to cat. Yes Cat is old but no leaks. Would you say Cat or O2 Upstream?

  16. DALE97DSM says:


  17. 4runner666 says:

    this is great. it can be hard to find info on older efi systems.

  18. dashwood123 says:

    I tried this test using a gas stove which did not work as it did not have enough heat. Then I tried it with a propane torch which was hot enough to conduct the test. The meter struggled to reach 0.9 within a minute, in fact it reached 0.9 for about 2 seconds, after that it would only hover around the 0.7 and 0.8 mark. I could not get it to reach 0.9 again.
    I suppose that means I need a new O2 sensor.

  19. CHAMPSWALL says:

    great video !

  20. studisme says:

    Absolutely Fantastic Guys. Thanx.
    I have 2 pre cat sensors on my Beemer. They cost over a £100 quid each!!
    Believe me, I dont want to replace them unless they are knackered. Now I know how to check them myself! Ive got a digital test meter, ive got the lambdas, and ive got half a brain. Why pay a mechanic £80 quid to test em, when you can do it yourself?! Really good stuff guys, well done.

  21. starcruise12345 says:

    Very nice videos. I learned a lot from you guys. Thanks

  22. pfun41 says:

    @studisme new cars stink. they can have 4 of those damn things. lucky my 94 only has one.

  23. johnobd says:

    great vid

  24. AmazGraz says:

    Brilliant! What is the correct lead to connect the positive voltmeter lead to? Mine only has four.

  25. leucadiamissy says:

    Thanks for the great video. We actually referenced it on our website: We sell Bosch and Denso oxygen sensors at the best prices and deliver them fast and cheap. OilFiltersOnline(dot)com

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