It started about two months ago. I would be driving the 2000 VW TDI Golf down the road and the engine would just STOP. It happened about once a week (500 miles). In the last few days it has become much worse. one day it happened 3 times on the way to work (50 miles). I'm not sure if you've looked at your daily commute like I have, but after you start having to look at a place like you have to make an emergency stop, it gets pretty scrary. I did a little reading on the net, and it looks like it could be one of two things. Injector pump (800$?) or Relay 109, the main relay that applies power to the ECU and a few other circuits in the car. if you have a TDI, make sure you head on over to tdiclub.com those guys are awesome. so I pulled out the torx screw driver, took a few bits a and pieces apart off the dash and ripped out relay 109. I called up the local VW shop, and they said the relay weas $28 (I thought it use to be $150, but maybe the price went down). conveniently enough, it was a special order part. hmm.... strange. any compentant shop would have a part that is KNOWN to be defective in stock so people arn't stranded. if your in reno, looking for a good vw shop, just keep on driving. Lithia VW is WORTHLESS.
I pulled Relay109 out, and proceeded to solder a bypass switch in the event it failed again, I could just flip a switch to bypass. I got that all soldered up and installed right before the big Turkey-Day trip. we didn't even make it out of town and the car failed. I flipped the switch, it started right up and were off!
if you find yourself needing relay 109, head on over to dieselgeek.com to get your own very own replacement Relay 109 for $16. I got mine shipped to our Turkey-day destination and we'll install it half way through the trip.