Author Topic: eek hekp - O2 sensor probs?  (Read 591 times)

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Offline tonyb

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  • old is good
eek hekp - O2 sensor probs?
« on: November 25, 2019, 02:23:39 pm »
My mk2 gti  8v (digifant, engine PB) has intermittent rough-running issues which, from various overseas chat groups, seem to be an O2 sensor problem.  I think this is a UK-market car, it was purchased new from the factory with the tourist-delivery scheme in place back then. I can see what looks like a sensor on the exhaust manifold, with a cable (looks like a stiff co-ax cable) running to it from a grommet in the firewall.  The cable is broken (at the sensor)and has an electric wire inside it.  I cannot find any sign of an O2 sensor for this vehicle with VW Heritage in the UK. Symptoms are sudden v rough running, sounds like its on 3 cylinders, smell v rich, wont rev much above idle, then it suddenly 'clears' and is fine. For a day or 2. Everything I read about Digifant systems is that this is a likely culprit for probs, on any engine with more than 100,000 miles.  I's like to replace it, but cant find one. Anyone got any ideas, similar issue, etc?
Mk2 Gti 8V digifant ( daily driver except when sons are home)
Mk2 Gti kjet ( sold)
Mk1 Gti (sold - bugger)
Mk2 Gti 16v (company car in the UK)
Westphalia camper ( sold)
Random old British cars and Italian motorbikes