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Oxygen Sensor Replacement (2000 VW Bora/Jetta 2.0L)

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May 1, 2012, 7:50 AM

Post #1 of 3 (3043 views)
Oxygen Sensor Replacement (2000 VW Bora/Jetta 2.0L) Sign In

For a while now, mums car has been having some issues.

-Poor fuel economy
-Rough idle
-Turns off whilst slowing down to a stop sometimes

We took it to a mechanic who ran a Diagnostics and he told us that the O2 sensors are failing. The post-cat O2 sensor is pretty much dead, and the pre-cat sensor is working, but not as good as it should.

I went ahead and ordered both sensors, and replaced the post-cat today.

I read a on a few forums that driving it around for 15-30mins to let the ECU readjust the sensor to perform accordingly.

However, after driving it for >30 mins, it has gotten worse.

The rough idle stayed the same, but the turning off whilst approaching a stop became more frequent.

I am yet to install the pre-cat O2 sensor, but I need some help getting to it and running the cable behind the heat shields properly.

The only other thing I can think of is faulty/dirty MAF which I'm planning to try and give it a clean with an MAF cleaner first, before ordering a new one (hopefully I wont have to)

Any other suggestions?


Tom Greenleaf
Ultimate Carjunky / Moderator
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May 1, 2012, 8:41 AM

Post #2 of 3 (3018 views)
Re: Oxygen Sensor Replacement (2000 VW Bora/Jetta 2.0L) [In reply to] Sign In

Not in that club. Driving it around is not going to repair a really/truly bad O2 sensor but can help to burn junk out of a converter. You've had the hands on diagnostics done that condemned it so when you get it put it in ASAP. Pre-cat O2 sensor can make a vehicle run lousy and the longer it is allowed to run lousy the more you are risking destroying the converter,

Long retired now

Hammer Time
Ultimate Carjunky / Moderator
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May 1, 2012, 10:29 AM

Post #3 of 3 (3004 views)
Re: Oxygen Sensor Replacement (2000 VW Bora/Jetta 2.0L) [In reply to] Sign In

TRhe downstream sensor has absolutely no control over fuel mixture. It's a Cat monitor only.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


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