Hi, I've got a 2008 Diesel Caddy van. I got it serviced the other day and now the check engine light is on and the only way to start the car is to disconnect the cabling that clicks into the thrust sensor and now I have lost cruise control and turbo. The mechanic who serviced it cleaned the engine with I know not what and is not a dealer but has a good name and is vague about being able to fix it. I don't entirely trust the dealer here (they are really Ford dealers who branched out into Volkswagen and have not been good when I have used them). Ideally I'd like a little bit of help please as to what it might be and can I fix it myself, before I head to the dealer and not sound like a bit of nong.