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no its not normal. it could be the car never saw the door open. do you get a door open warning on the dash when that particular door is open? you belong to the german auto club?
you have to remove the cover by the windshield and remove the wiper arms to get the complete wiper assembly out. then the motor car be replaced on the bench. if you are not careful, expect to replace the windshield. be gentle around the area. you may need to "time" the motor with the arms off to prevent wipers stopping in the wrong spot.
usually the flasher switch (hazard light switch) is also the flasher relay. red thing with the triangle.
the dealer will run your vin and give you any recall info. it takes minimal effort on their part so it should be free. the dealer can also see any open "rvu's" required vehicle updates that may be open from vw but not listed in a "recall" website.
replacing the whole compressor may cost more in labor. i expect you refrigerant was full (no leaks, a/c cold?) so it should be recycled and reused. don't pay for refrigerant (freon, suva, etc). a new vw compressor comes completely filled with full system capacity of oil! it must be measured and adjusted to match what came out of the old compressor if you decide to replace the whole compressor.
what fault code is stored? if there is a code for cam/crank allocation it means the timing is off and needs to be redone. other than a mistake on belt assembly there may be a hose or wire that failed due to being disturbed during repair (not allways the shops fault, stuff happens)
this job is no picnic! a special socket is needed and depending on which sensor, maybe a box of band-aids. unless you can replace easy stuff like brakes,oil,etc i'd keep paying for replacement of sensor as the prefered option. no offense intended.
find good rotors from aftermarket but stick to "audi" pads. audi has numerous pads thet all look alike but have differences depending on the year/model used in. aftermarket usually uses 1 or 2 pad types as long as they fit!
the light flashes for 3 reasons: 1) coolant level low...check for leaks 2) car overheating...don't drive, may cause damage 3) plug under reservoir unplugged or wires damaged...repair as needed.
have you had front end repairs like body work? the sensor for homelink is behind the front bumper. have the wiring, sensor and connection checked. the cost may be greater to go to someone that did'nt even know there is a sensor in front. homelink has a web site to help programming and there is a pod cast from audi to help.