My golf 5 2.0 FSI front wipers has stopped working but the rear one is fine, what can be the problem?

All VW built after 1994 ascribed to the OBD II standard, meaning it has an ECU (engine Control unit) which interfaces with various other modules in the car that controls sub-circuits. For example, Central Electronics Module, ABS module, Temperature Control Module, Speed-o-cruise Module, etc... When one of them detects a fault with one of its components it registers a fault in the non-volatile memory. Even if you replace the faulty component, like in your case you replaced the wiper motor, it still wont work. You first have to clear the error from non-volatile memory with a diagnostic tester. Then and only then will it work. I suggest you go to http://volkswagen-polo-highline.blogspot.com/ and read up on this. Hope it helped

Front wipers of vw golf not working