Could be many reasons. May be a sensor in the brake system. A garage will have the code readers and will check it. As it's a safety item I would recommend that you refer to a garage right away. The scope of the question us too large to answer with any certainty on here
SOURCE: underperforming catalist
readings taken downstream (exhaust) with the O2 sensor are telling your computer that the catalytic converter is not doing its job well enough (it is reading too high an exhaust content of carbon monoxide or hydrocarbons) the solution is to replace the catalytic converter assuming the engine and its other management systems are performing healthy ....good luck
SOURCE: 1999 passat and the oil loght blinks with the brake light and the
You must put oil in the engine
SOURCE: abs fault on vw passat
Dear All
After taking the car back to our most excellent garage they quickly diagnosed the fault with the ABS. It was to do with the gap between the sensor and the wheel - it has to be a very precise distance and was disturbed by the changing of the CV boot (seems to be a common problem).
Half hour later and it is as good as new - this was after lots of electronic testing etc. - the clue was that it didn't give any registered fault on the diagnostic computer.
Hope this helps you Saxoste
Jon A
SOURCE: ABS/BRAKE warning lights always on in 2000 VW Passat
dont guess !! get it plugged into a scanner and see what the code is
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