SOURCE: car won't start in rain
Sounds like the distributor cap is cracked and allowing moisture in. I would start there.
SOURCE: check engine light on, car shakes while in reverse, stalls ...
it could be your mass air flow sensor? try checking that
SOURCE: battery drain
My wife's 2001 Jetta TDI had the same problem. First we changed the battery. (It was just about due anyway) No change. We then traced the power drain to the in-trunk mounted CD changer. This was an aftermarket CD changer but we went to the same source that the VW dealership uses. Of course one blames the other. The CD changer was even replaced with no change. If we are not using the car for long trips we unplug the CD changer and no more dead battery! Neither the VW dealer nor the AV installer could give us a good working solution to this problem.
SOURCE: 03 VW Passat with P0300, P0303, p0304, and P0302.
All those codes mean a specific cylinder missfire. Start with tune up. Plugs, wires & air & fuel filters.
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