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    Thread: DIY - Replacing oxygen sensors

    1. Member zero666cool's Avatar
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      56 Merc 190SL, 66 Jag 3.8S, 13 Volvo S60R, 10 S40, 09 GTI, 12 Golf, 92 SLC, 89 GTI VR6
      04-27-2006 12:40 PM #26
      Quote, originally posted by MacDalund »
      As of 12/05:
      021-906-262-B is $39.50
      06A-906-262-Q is $18.86
      Question: when searching on 1stvwparts.com for the latter part no. a lot of different years and engines appear but there is no selection for the VR6. When I search through their catalog for the O2 sensor by keyword I find a 2.8L Rear O2 listed for $125.70. Are these parts the same and can I just "pick" an option from the list when I search by part no. and buy a "1.8L" O2 sensor?
      My CEL is on and the Autozone scan comes back the dreaded P0420.
      I'm mentally ready to replace my cat because of all this but I was going to do the O2 sensors anyway for preventative maintenance and this is a cheaper way to possibly rule out having to replace the cat.
      I'm at 121k


      You can also splice your O2s, what year is your car? 1stparts had the price set to 18 untill a week or so ago for the precat I believe the 4 wire one, but now it is back to 92. ECStuning still sells it for $22.50 I just got 2 of them the other day before they raise the price again
      here is a post I created the other day:
      http://forums.vwvortex.com/zerothread?id=2576309
      it might help you get the cheapest one...

    2. 04-27-2006 09:55 PM #27
      I've got a 1999 MKIV GTI VR6. I want to keep things OEM for now, so not too sure about the splicing. Just looking for the best price.

    3. Member zero666cool's Avatar
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      04-28-2006 11:39 AM #28
      Actually that link that I sent you, ECS tuning one would've worked on your car as it was for MKVI and not MK3, MK3 guys had to splice it but it would've been plug an play for you, too bad they just raised the price today back to $99.99, while I purchased them for $22.00 2 days ago, I got lucky I knew it was gonna go up


      Modified by zero666cool at 8:40 AM 4-28-2006

    4. Senior Member mujjuman's Avatar
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      10-07-2006 05:15 PM #29
      tahnks for the DIY [IMG]http://**********************/smile/emthup.gif[/IMG]
      mujjuman

    5. 10-18-2006 08:26 PM #30
      hi there
      is this DIY the same procedure for a 2002 Jetta 1.8T ?
      Is the layout of the sensors under the car the same ?
      thanks in advance

    6. Banned
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      12-02-2006 06:39 PM #31
      Thanks for the DIY. WD-40 really helped get the old sensor loose.

    7. 12-03-2006 01:49 PM #32
      Quote, originally posted by puntadigital »
      hi there
      is this DIY the same procedure for a 2002 Jetta 1.8T ?
      Is the layout of the sensors under the car the same ?
      thanks in advance

      I replaced the front (pre-cat) O2 sensore in my 2002 1.8T GTI, and it looked pretty much identical.
      It'll be easy to figure out the pre-cat versus the post-cat sensors. Since the black plastic box that covers the connectors is basically within a foot or so of where the sensors are located in the exhaust system, it's pretty easy to figure out which connector goes to which sensor.
      Even though they use different connectors, it still makes sense to replace one sensor at a time to prevent the possibility of putting a front O2 sensor in the post-cat position...know what I mean?
      Good luck down there! And if you haven't already bought one, the oxygen sensor removing tool is pretty cheap at Advance Auto...I paid $11 for mine, and it says it has a lifetime warranty.

    8. 02-10-2007 05:31 PM #33
      great diy , completed both oxygen sensors in about an hour , a little wd-40 and they broke free really easy. thanks [IMG]http://**********************/smile/emthup.gif[/IMG]

    9. 03-13-2007 06:38 PM #34
      I can only find one sensor on the cat and it appears to be the post. The fault i am getting is for the pre cat. What am I doing wrong? Any help for a newbie is greatly appreciated. 2001 Jetta 2.0L.
      Thanks

    10. Banned
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      03-13-2007 06:47 PM #35
      Quote, originally posted by cinzanoum »
      I can only find one sensor on the cat and it appears to be the post. The fault i am getting is for the pre cat. What am I doing wrong? Any help for a newbie is greatly appreciated. 2001 Jetta 2.0L.
      Thanks

      is it possible someone removed it and plugged the hole, thus a CEL????

    11. 03-13-2007 07:59 PM #36
      The sensor for the 2.0 may be on the downpipe. Pop the hood and look behind the engine for the sensor. You can also follow the wires for the pre-cat sensor from the little black box up to the sensor.
      Woohoo! Post 12345!!!


      Modified by VgRt6 at 9:03 PM 3-13-2007

    12. Banned
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      03-13-2007 08:11 PM #37
      Quote, originally posted by VgRt6 »
      The sensor for the 2.0 may be on the downpipe. Pop the hood and look behind the engine for the sensor. You can also follow the wires for the pre-cat sensor for the little black box up to the sensor.
      Woohoo! Post 12345!!!
      you've helped out the vw community so much..
      now will you father my children?

    13. 03-13-2007 08:13 PM #38
      Quote, originally posted by cinzanoum »
      I can only find one sensor on the cat and it appears to be the post. The fault i am getting is for the pre cat. What am I doing wrong? Any help for a newbie is greatly appreciated. 2001 Jetta 2.0L.
      Thanks

      The Precat O2 sensor for the 2.0L is on the exhaust manifold. [IMG]http://**********************/smile/emthup.gif[/IMG]

    14. 03-13-2007 09:04 PM #39
      Quote, originally posted by Tolageak »
      you've helped out the vw community so much..
      now will you father my children?

      Are you hot? J/K.

    15. 04-11-2007 10:12 AM #40
      FYI-I did both my o2 sensors a little while ago and tried something I had not seen on the forum. While I waited for the exhaust to cool enough to work around, I put the offset tool in the freezer. Once the exhaust was cool enough but, still warm, I sprayed a very small amount of WD-40 on the threading and disconnected the wire/plug for the sensor I was removing. Then, I took the offset tool out of the freezer and got it into position. I applied moderate pressure for a few seconds to allow some of the heat to transfer, then applied more pressure and the sensor unscrewed quite easily.

    16. 04-20-2007 04:20 PM #41
      sweet

    17. 07-10-2007 02:35 AM #42
      Hmmm, just replaced mine. My car smelled like a gas station before I changed them, now it's nice and clean. My car is finally a bit more gas efficient again! They came out very easy amazingly.
      It is so handy having these DIY's Thanks again!

      My pre-cat O2 sensor was exactly like this one... with black chalky stuff all over it. I read on Wikipedia:
      "An overly rich mixture causes buildup of black powdery deposit on the probe. This may be caused by failure of the probe itself, or by a problem elsewhere in the fuel rationing system." -wikipedia.com

      Just wanted to let anyone else know that was doing this DIY that it may be fairly normal if you have been driving the car for awhile with the O2 sensor not working...

    18. 07-26-2007 05:11 PM #43
      thank you sir i need this

    19. 10-01-2007 06:02 PM #44
      Em.... I wanted to ask if it will harm the car to remove the 2 sensors and drive the car to the shop to show them the exact sensor type, but I just realised ... that will mean driving with big holes in the exhaust, right ?

    20. 11-11-2007 02:00 AM #45
      Just wanted to say thanks for this. With your DIY guide I had no problems. Thank you

    21. 05-17-2008 07:00 PM #46
      Excellent write up. thought I replied but it seems ot have gotten lost. I replaced the pre cat sensor but could not get thepost sensor out for anything. I am goingot have to buy the special sensor tool. this is my first repair on the vw mechanically.

    22. 05-17-2008 07:48 PM #47
      has anyone removed the post cat sensor with just an open ended flat wrench? stuck isnt the issue, the fact that its on an angle, the wrench head wont rotate and slips right off. i read the secondary isnt for smooth running anyways. my cell went away with just the precat sensor being replaced. and my gas mileage went back up to 25mpg avg on the vr.

    23. 05-21-2008 05:28 PM #48
      i have not. but i found an 22mm oxygen sensor wrench for 12$ (US). Originally i had spent 2 hours trying to get the post-cat off with a variety of tools. this time it took 20 minutes as i still had to loosen it up. TOTALLY worth it. jus go buy it. Most cat sensors are 22 mm now adays so itis not a one time use tool.

    24. 02-17-2009 06:31 PM #49
      great diy. did mine in about 15 mins, the pre cat. didnt have the right sensor tool, but used open faced wrench w/no probs. thanks man.

    25. Member Spindle's Avatar
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      03-18-2009 11:46 AM #50
      Yay! Another satisifed customer....Thanks to VgRt6 and others for the info..!!! [IMG]http://**********************/smile/emthup.gif[/IMG]
      I just did the pre-cat (had CEL w/pre-cat heater failure code). I found that my Craftsman 22mm open/box wrench's slightly angled box end fit best for removing. I just cut the harness near the sensor and slipped the wrench over. I used the open end for install since it didn't need near as much torque. I did hose it w/PB and tapped it then let it sit ~20 mins before trying to remove. After that, one small whack with a hammer on the wrench and it spun right out.

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