Just bought my third Passat project car, a 2003 1.8T with 120K on it for $700. Was running really bad, now won't start at all. Turns over at about the correct rate, and coughs from time to time. Checked timing belt and it's still intact. Using a standard OBDII code reader popped the following codes:
P0300 - Random Misfire
P0301-P0304 - Misfire on each cylinder
P0118 - Coolant temp circuit high input
P0171 - Too lean bank one
P0340 - Cam sensor malfunction
P0011 - "A" cam position timing over advanced or system performance
P2181 - Coolant system malfunction
P2101 - Throttle actuator circuit rang/performance
So, I'm going to start by checking the timing and compression.
Any guesses out there? Timing belt jumped a tooth? VCT failure? Crank or cam sensor failure? Throttle body problem?
Place your bets, place your bets!