Golf keeps stalling, mechanics can't find problem

I have a 96 Golf, 2.0L gas engine, that occasionally loses power and stalls, usually in stop & go traffic. It is throwing the code P0134, which is for an oxygen sensor not responding.

Both O2 sensors have been replaced twice in the past year. The car has received new wires, plugs, distributor cap, etc. in recent years.

The first mechanic kept changing the O2 sensors. The second mechanic tried a new Mass Air Flow sensor, but same result. He tested the O2 sensors and found them to be fine. He found good fuel pressure. He indicated that the computer was getting good inputs but providing bad outputs. So he recommended changing the computer. We had him put a used computer in the car. It worked fine for a day or two, but the car is once again behaving the same.

Has anyone else had this problem? What are the mechanics missing? '

Thanks!

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Might be a bad crankshaft position sensor. Bad ign switch maybe. Do you keep a lot of keys with your ign key? I have changed a lot of bad/defective/weak ign coils on the 2.0l engines but usually the power is weak and the engine won't restart easily and act good.

BTW The ross-tech.com vag-com tool will probably give you a little more information than just P0134. ;-)

--
later,
dave
(One out of many daves)
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Have you replaced your fuel filter recently?

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Beat me too it. Our VR6 VW camper had exactly these symptoms when we first got it. Turned out to be the fuel filter.

Peter Wieck Wyncote, PA

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In rec.autos.makers.vw.watercooled, Chris Wilkinson wrote:

This is not related to the code, but I suggest you idle the engine in the dark. Look for sparking. If no sparking, try spraying a fine water mist from a spray bottle toward the wiring. Note where the arcing occurs.

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If your model yr still uses a fuel relay on the fuse panel try replacing that. It's fairly inexpensive and solved a similar problem for me. The relay would just drop out and then after a few attempts it would restart.

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