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    Thread: Symptoms of a bad oxygen sensor!

    1. 07-23-2002 02:19 AM #1
      Well I have about 100k on the engine and have never had the Oxygen sensor replaced and am just curious what some of the symptoms are of it going bad! I know the computer will go into limp mode and the car will still drive!
      My car seems to be running rich when cold and smoking ( or bad valve seals) and my car is getting bad gas milage! also my car seems to be pinging a little under light acceleration! any help would be appriciated Adam also my car doesn't burn Oil!

    2. Member Red Baron Golf's Avatar
      Join Date
      Jul 18th, 2000
      Ontario, Canada
      1995 VW Cabrio, 2011 Honda Odyseey Touring, 2015 Audi S3
      07-23-2002 04:06 PM #2
      Sounds like you got a bad sensor for sure, but make sure there isn't anything else wrong. Is it throwing any CEL's?
      You basically described the symptoms yourself.
      1995 VW Cabrio 5spd
      2011 Honda Odyssey Touring
      2016 VW Touareg Wolfsburg Edition

    3. 07-23-2002 07:42 PM #3
      when my O2 went bad my car just stopped running...

    4. 07-24-2002 03:08 AM #4
      About 4000 miles ago, my CEL came on. This was just about the time I turned 100K. I have had no noticable problems with the engine other than some less-than-wonderful gas mileage. A friend of mine said that he thought it could be the 02 sensor. Is there any way I can check without having to pay for a diagnostic?

      [Modified by golfracer04, 12:09 AM 7-24-2002]

    5. 07-24-2002 08:48 AM #5
      Run a search for O2 Sensor, I remember a thread at some point that goes into more detail, but I believe you can pull the O2 sensor out and tell by coloration (if sensor is chalky looking it's worn out) whether it's still good.

    6. Member
      Join Date
      Apr 8th, 2002
      MD, USA
      '98 GTi / '02 Jetta 1.8T / '04 GTi VR6 / '06 A6 Avant 3.2 / '08 A3 2.0T / '08 A4 2.0T
      07-24-2002 06:39 PM #6
      FYI, there are 2 O2 sensors. One pre-catalytic and one post-cat. They are practically right next to each other and look identical.

    7. Member
      Join Date
      Sep 5th, 2000
      Starkville, MS
      2006 CW GTI, 2012 CW Tiguan APR stg I, 1982 Rabbit Convertible
      07-24-2002 07:08 PM #7
      The symptoms sound like they could be due to a bad oxygen sensor. In any event, at 100,000 miles, it would be a good idea to replace it anyway. My car has 81,000 miles, and I just checked the sensor according to the voltage tests in the Bentley manual.
      Pulling an injector plug and pulling the vacuum hose off the fuel pressure regular tested OK for high and low voltage response, but with everything hooked up normally, the voltage pulses took two seconds to go up and two seconds to go down (oscillating between .3 and .7 volts). It ought to be more like a pulse every half second. A bad oxygen sensor that produces a too rich mixture can ruin tha catalytic converter ($!).

    8. 07-24-2002 07:20 PM #8
      arent there only 2 O2 sensors on post 96 models (the OBD2 switch) ????

    9. 07-24-2002 07:22 PM #9
      or did VW do that early? in 93

    10. 07-25-2002 02:05 AM #10
      I will throw the new sensor in tomorrow and I will let everyone know if that was the problem! also I think there is only one Oxygen sensor on the OBD1

    11. 07-25-2002 11:41 AM #11
      ... also I think there is only one Oxygen sensor on the OBD1
      Correct. 2 in the OBDII.

    12. Member
      Join Date
      Apr 8th, 2002
      MD, USA
      '98 GTi / '02 Jetta 1.8T / '04 GTi VR6 / '06 A6 Avant 3.2 / '08 A3 2.0T / '08 A4 2.0T
      07-25-2002 02:29 PM #12
      While we're on the subject, has anyone tried a replacement sensor other than the $80+ Bosch ones?

    13. 07-25-2002 03:54 PM #13
      I think you can get cheaper ones if you don't mind soldering....
      By that I mean I think you can buy them without the connector.

    14. Banned
      Join Date
      May 16th, 2002
      07-29-2002 05:45 AM #14
      Don't use anything but Bosch sensors,you'll be sorry.....And if your o2 sensor was bad it would throw a code.

    15. 07-29-2002 09:31 PM #15
      can you tell me where the o2 sensors located in an 00 jetta?

    16. 07-29-2002 10:14 PM #16
      basically the same place as the 96 jetta described above. pre cat and post cat i belive

    17. 08-01-2002 11:57 PM #17
      I repaced the sensor today and it totaly fixed my car! the car runs perfect! I have been driving the car around for about 2 years with these problems , I just fugured my engine was getting old and eaven on my last birthday bought a intake to mask the sound of the slight pinging! these sensors must just take a wile to go out and its so gradual you cant eaven tell untill your car starts smoking at startup under acceleration and gas milage slightle gets worse and the engine sounds like a wrist pin is loose and knocking under light acceleration! I must not have a check engine light being its a 93 but I bet if I would have had the shop run the codes it would have poped up! Well shes fixed and running strong and back to the car I loved to drive whene I bought it so its all good and will experience farfignugen once again! "have not heard that word in a wile"

    18. 08-03-2002 02:08 PM #18
      Thanks for the location, brought my 2000 jetta into the vdub shop for a sensor then they tell me no you should have us run a $80 test first. Symtums) fan does not turn on to regulate temp, overheating, engine light constantly on, rpm's real high at stop signs etc., 70% driving perfection.
      Can anyone help me it's urgent??????

    19. Member 98wolfie's Avatar
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      Jun 1st, 2002
      Chicago, IL
      2006 B6 Passat 2.0T
      08-03-2002 06:00 PM #19
      Do you guys think I'm having the same problem? I have a 98 Jetta 2.0 w/120,000miles and the car sputters at startup, exhaust is a little smoky, and gas mileage isn't very great anymore. Do you think my O2 sensor is shot?

    20. Member
      Join Date
      Apr 8th, 2002
      MD, USA
      '98 GTi / '02 Jetta 1.8T / '04 GTi VR6 / '06 A6 Avant 3.2 / '08 A3 2.0T / '08 A4 2.0T
      08-04-2002 11:12 AM #20
      Although those symptoms are similar to a bad O2 sensor, it doesn't mean that's the only thing wrong. If you never replaced it them, i'd definitely get it your vw vagged and see if it's throwin codes.

    21. 08-05-2002 08:57 PM #21
      doesn't it feel great to have things up and running!? hopefully we will have some good luck with replacing the sensor too! happy driving [IMG]http://*****************.com/smile/emthup.gif[/IMG]

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