Fuel Injection problems of the 2000 Volkswagen Jetta

Volkswagen 2000 Jetta uncommanded acceleration while driving. Car has no cruise control yet car accelerates on its own to the point the car has to be braked hard.

I am the primary repair person for this vehicle. Over its history, there have been numerous component failures that in my opinion are unacceptable for a vehicle with this mileage and age. I personally know the owner, and know that it is not operated under unusually harsh conditions. The vehicle was involved in a minor cosmetic crash early on, otherwise, there have been no unusual outside factors. At this point, the car has only 37,000 miles on the odometer. Primary use is on long trips. The vehicle is parked and stored for about 3-6 months each year. First problem: air conditioning system leak: the expansion valve failed, requiring replacement. Check engine/ malfunction indicator light: has come on several times, each time with the same dtc, a manufacturer specific code related to the mass air flow sensor. The power windows have failed, ultimately resulting in free repair of the windows with a revised retaining clip, as this problem occurs far too often, and finally, the rear brake pads have worn completely with the front pads in virtually new condition. This is accompanied by all four rotors being excessively pitted, with large areas of the rotor face actually flaking off. My research shows that I may end up needing to replace the rear calipers, as well, due to poor design.

My car is nightmare of failures. Cruise control light (dealer claims the car doesnt have one - but you can see it if you use a flashlight at an oblique angle) failure, abs module switch failure (according to dealer) causing cruise control to unexpectedly disengage. I also learned from other motorists that the same switch controls brake light illumination (all bulbs and other signal lights work). Fuel injection module over injected gas causing excessive pressure. Relief valve failed to open causing turbo overpressure to +120psi. Failure caused hoses to blow sending hose clamps as projectiles. This week, the front passenger side window unexpectedly dropped into the door. Dealer has literally taped the window up until a part arrives. Dealer admits to mfg design defect - no voluntary recall. No dealers will voluntarily replace clips until they fail. Volkswagen position is that they know there is a design flaw, but wont replace known bad clips until there is a failure. Window failure could cause objects (stones kicked up by tires of other cars) to hit passengers. Infant / child safety risk. Window integrity questionable in an accident if it fails when driving 15mph. Help!.

While driving engine light comes on due to emission failure. Dealership replaced the mass air flow sensor, but the problem recurred. Currently, air injection pump was being replaced.