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Thread: Oxygen Sensor Change with Photos

  1. #1
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    2002 Mazda Protege5

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    Thumbs up Oxygen Sensor Change with Photos

    First I'd like to point out that I was able to get the Upstream OEM Denso for $30.00 USD Shipped. I've been using DENSO for years and I can swear by them.
    Here is the link for anyone intrested:
    http://www.ebay.com/itm/380448114964...S:3160&vxp=mtr

    Now for the fun part.

    Disconnect Battery Cable - This way the computer will reset itself to accomodate the new sensor.

    Remove air intake snorkel:


    Unplug to old sensor. Mine did not want to disconnect so I use a small flat blade screw driver.



    Remove the heat sheild. 10mm bolts. Three on top one on bottom of sheild


    Remove Sensor with sensor socket. I used a 7/8 wrench and had no problems:


    Removed Sensor:


    Compare Sensors:


    Compare Plugs:


    Re-install everything in reverse order

    I applied Dielectric grease as a personal preference:


    I put grease in and out of plug:


    New Sensor installed:


    Sensor Plugged in:


    I left my heat sheild off as it was rusted out till I find a repleacement. I re-installed the air intake snorkel back on:


    Re-connected the battery and started the the car right up. Car feels like it's pulling harder but that may be just me.

    I also cleaned the Mass Sensor, Throttle Body, EGR valve and changed the plugs.

    Hope this helps anyone out there looking to do this.

    This is very simple as long as the old sensor is not seized in.
    Last edited by vicvega; 08-06-2012 at 07:35 PM.
    Vic Vega
    2002 P5

  2. #2
    Registered Member tweety2300's Avatar

    2001 mazda protege mp3

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    virginia
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    Couple of things
    Pics don't work
    I would highly suggest using the o2 socket as you can rent it at autozone for free and it will garunteed you won't strip it off.

  3. #3
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    Good write-up.

    In addition to what tweety2300 said, I wouldn't recommend putting dielectric grease on the contacts, it might give you continuity problems in the future. Rub it on the outside of the connector to ease installation/removal but that's it.

  4. #4
    ~Rico~ RicoP5's Avatar
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    2002 Mazda Protege 5, red

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    I know the downstream one I replaced it was that long but the upstream one wire is. It that long ? Y is the one u got so long ? Makes me think it's a downstream one? Jw because I need to replace my upstream one and would hate to order the wrong one ..
    Sedan front end,white rx8 wheels ,aac 13' brakes kit(reserved), NGR hub with quick release and sparco wheel, system, hids, exhaust, headers, Injen cold air intake, adjustable rear endlinks,moog front end links, engine bay washer dress up kit, shorty antenna, interior leds,rear hatch led, braided clutch line, jdm tailights, wink mirror,sickspeed horns, CF brake handle, redlinegoods shift boot, cr3 rad brackets. coil sleeves,
    My P5 build thread
    http://www.mazdas247.com/forum/showt...ke-one-too-lol
    emergency part out!

    http://www.mazdas247.com/forum/showt...ajor-emergency

  5. #5
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    2002 Mazda Protege5

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    Pictures fixed. Thanks for the tip on the grease. I've never had a problem before but I will keep an eye out.
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  6. #6
    Registered Member

    2002 Mazda Protege5

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    I double checked the part number at the local parts store and online and made sure it was an upstream before ordering it.
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  7. #7
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    The Bosch one I bought also had a very long wire. There's probably another car that uses the same connector but with a longer wire...

  8. #8
    ~Rico~ RicoP5's Avatar
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    2002 Mazda Protege 5, red

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    Sounds good thx
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  9. #9
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    Mazda 2002 BJ Astina 323 1.8 L

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    Dielectric grease is non-conductive and is designed for eliminating air-pockets between semi-conductors and heat-sinks. In some cars which have a single wire, the thread needs to be a good connection to the exhaust. In some cars, they use a heating element which may also need a good earth via the threads. Copper impregnated grease maintains a good electrical connection and stops seizing.

    JJ

  10. #10
    Registered Member CR3 Motorsports's Avatar
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    Would you happen to have an updated link to the Denso o2 sensor on Ebay? I couldnt find it at $30.
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  11. #11
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    Rockauto's got the Denso (more money though)


  12. #12
    Registered Member rit14623's Avatar

    2002 Mazda Protege5

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    Never noticed this thread until now. I see the Denso's O2 sensor tip is a bit narrower than the other one, maybe Bosch.
    I couldn't do the spark-plug non-fouler thing because the Bosch O2 sensor didn't fit through after drilling it out with a 1/2" drill bit.

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