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If it is the 1.6 FSI model, it is very sensitive to the type of gasoline, it should be octane 97 or higher. Very commonly, owners of this model use the 95 Octane gasoline, which seems to work ok, but the sensors in the exhaust (yellow motorwarning light) will eventually (can take a few years) clog up and you cant clean it or change the sensor easy either as you need to remove the whole exhaust system.
So either you let VW fix this for you (expensive) or you do it yourself (need a decent garage, equipment and a new sensor).
Got to have the special tools (or equivalent) to hold down the pulley bolts if it's a VR6. A 2.0l you'll need a timing belt tensioner tool besides the pulley counter holder. And better buy a Bentley official VW repair manual. Buying a Chillton, Hayes or Clymers will make your repair more difficult to understand.
could be numerous of thing and the list can go on, especially at times it run like a dream than other time it run horrible. Go to auto zone and have them plug it to computer for free and see if will throw a code, this way it will narrow it down instead of guessing and buying parts hoping that will fix the issue, this can be very expensive and there is no way to test the parts, beside checking the basic, plug, wires and coil. the computer will help narrow it down than guessing. then re post and one of us will try to walk you through it.
ac parts is high when you do it your self .buy refrigerant. 30 lbs 134 cost 80.00 dollars. you have to have a vacuum pump.to pump it down.compressor cost anywhere from 380.00 up to 600.00 dollars.
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