We do loads of timing belts and I must admit I have done two on VW's and the MIL has come on instantly they start, when I code read it is always a cam sensor fault logged, when I re-check something is always just slightly out even though you double check
The last one was a Ibiza PD ASZ, it was all locked up and tipex for extra measure, when I went to put the belt on it was a fraction out on the cam, but I could not get enough adjustment slackening the 3 bolt off (up against the edge of the slots). I just tweaked the belt on so it was all in its original position, but when I started it up the MIL came on
I had to strip again and take the cam pulley off and move round to get a full movement to set in the right place
My conclusion was that this had not been right from when it left the factory. The customer had had the car from new, few days later called to say it seems to have more power than before
So I would say that if the MIL is on after a belt change then its 99% a mechanical timing issue
Peter
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