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There are a few things that can go wrong here. One is a bad gas cap. Dealer charges $45, and AutozoneAz charges $10. Your call there. But first, clean around where the gas cap meets the filler adapter to see if dirt has built up. If so, the gas cap is not making a good seal. On a hot day, you should hear the gas escape from the tank when opening the cap (well, on a gas car, maybe not a diesel). There is also a valve that is near the air intake box that may need replacing. It is a very easy replacement and does not require a mechanic to do. It is different from car to car, but on my Passat it's called an N80 valve. It opens a line to the evap canister to get that fuel to burn.
Worst case would be the canister as it is about $200. So do the cleaning first, then the gas cap, then the N80 (or whatever it's called on a Jetta TDI).
unlock all doors. if it isnt working, either your vacuum system has a leak (most likely no locks will operate automatically) or the actuator is bad. actuator pushes a pin forward from the trunk area into a hole in the door which keeps it shut/locked with doors locked.
TELL ME WHAT PROBLEM YOU HAVING.IF TURN SIGNAL LIGHTS DONT WORK YOU CHECK BULBS + SOCKETS AND THE FUSE.IF ALL OKAY PROBLEM IS IN FLASHER UNIT SWITCH OR LOOSE OPEN WIRE CONNECTION.IF EVERY THING CHECK OUT GOOD TURN SIGNAL SWITCH IS FAULTY.
check gas cap . use scanner when check engine light comes on you got a problem some where . scanner will give you a code . you got a bad sensor . fix it . the scanner will have to erase code.if you dont repair sensor .the check engine light will stay on.