Started getting code P0106 – MAP sensor implausible reading. Transmission began to shift very roughly, and the entire PRNDS lit up on the multifunction display, instead of just the selected gear. After many hours of internet research determined that: 1. MAP sensors fail often on VW’s. Nobody knows why but maybe because PCV valve gets old and excess oil gets to manifold and coats the sensor. 2. When this code occurs several times, the transmission management computer drops its link to the engine management computer and goes into “limp” mode, accounting for the rough shifting and the PRNDS light show.

What I tried and results: 1. Cleaned the map sensor and the manifold. Both were oily. Cleared codes. Problem came back in a week. 2. Replaced the map sensor and the valve cover (PCV valve is integral to the cover, you have to replace the whole thing. Total cost $250. Cleared codes. Problem came back in 9 months. Manifold is oily again. 3. Found a “trick” on the internet to reset the transmission: Clear codes; key on; gas pedal to floor; wait 30 seconds; key off; gas pedal off; key on; wait 5 minutes; start car; stand on head; whistle “Die Valkyrie” by Wagner (OK, made that last one up). That fixes the transmission for 3 days to a week. I’m guessing only until the MAP codes trigger it again. 4. Asked the dealer if they had a TSB or other info on this. All they said is “Bring it in and we’ll look at it”. They’ve serviced my car 3 times since I’ve owned it. Every time they screwed it up. One time they caused significant damage. NO WAY are they ever touching it again.

Very annoying and I’m thinking will eventually destroy the transmission. Best guess is there’s something else causing oil to get into the manifold, but I don’t know what. Everything worked fine until 130K miles, at least with the drivetrain. Don’t get me started on the disintegrating interior.

Next steps: Replace the sensor again. $75 every nine months – I can live with it. After that, buy another car, which will definitely NOT be a VW.