My car is always throwing the check engine light, for catalytic converter efficiency and always has done since I bought it 1 year ago. I clear the fault and a few weeks will go by before it pops up again.
The low cat efficiency fault is triggered when the cats are below 94% efficient, and after I cleared the fault on mine on MOT day (to get rid of the CEL) the car was MOT'd and flew through the emissions test with no problem whatsoever, so even at less than 94% they are still way good enough for a UK MOT.
VAG-COM or VCDS as its now known is invaluable on these cars, and means I can clear the cat fault as soon as it rears its head, and make sure its nothing else.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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