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Volkswagen Jetta, Golf, GTI: 1999-2005, R32: 2004 (A4) 2000 Jetta Oxygen Sensor


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Last Post: Mar 10, 2008 6:05 PM Last Post By: ChrisR15
ChrisR15

Posts: 6
Registered: 11/15/05
2000 Jetta Oxygen Sensor
Posted: Mar 3, 2008 7:38 PM
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I replaced my wife's 2000 Jetta Oxygen sensor. It was a 4 wire oxygen sensor. I then had the check engine light turned off. About 2 minutes after driving away, it came back on. I had the light removed again a few weeks later, it came back on after about 20-30 min. of driving.

Why would this keep tripping the check engine light when it was replaced with a new sensor?
Turbo510

Posts: 471
Registered: 09/12/05
Re: 2000 Jetta Oxygen Sensor
Posted: Mar 3, 2008 8:36 PM   in response to: ChrisR15 in response to: ChrisR15
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I assume that you were told your car needed an Oxygen sensor, but to know why you still get the CEL coming on, you need to know what code(s) are being set. Your car has two Oxygen sensors, and each can set several fault codes.

Get the fault codes retrieved using an OBD II diagnostic tool; some auto parts stores will let you borrow one to do this right in their parking lot. If you prefer to get your own scanner, consider a PC-based VAG-COM or similar interface adapter.
ChrisR15

Posts: 6
Registered: 11/15/05
Re: 2000 Jetta Oxygen Sensor
Posted: Mar 10, 2008 6:05 PM   in response to: Turbo510 in response to: Turbo510
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Ok...finally got around to getting the codes again.

P0134 02 Senor CKT No activity (Bank 1 Sensor 1)
Is this basically saying that the sensor installed is not being read in any capacity?

The other two codes likely come from this problem:

P1255
P1296
Both something with Fuel Air Metering

One more question...I thought maybe the tuneup and O2 sensor would help with a problem starting the vehicle, it doesn't happen every time, but from time to time it has a tough time starting. It turns over every time, but sometimes will start and die, and other times will take 3-4 times before it starts. Could that relate to this? One thing I think could be the issue is an old Timing belt...am I correct?

Thanks


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