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If you are referring to the brake lights it is probably a bad brake light switch. Your vehicle may also have daytime running lights which would be on without the parking lights.
ynyqi have the same thing happening to my 2003 passat. did you find any reason why this occurs?
I have changed the headlight but I need to adjust it as the lights don't hit the road
how to change a headlight on a 2003 passat
Tail lights and brake lights fuse.
The 2003 Volkswagen Passat has 20 valves.
how do I remove a tire from a VW 2003 Passat
where is the running light sensor on a 2003 grand marque
The 2003 Volkswagen Passat is a gas-powered vehicle.
The 2003 Volkswagen Passat has an inline 4 engine.
The 2003 Volkswagen Passat has a 5-speed manual.
The height of the 2003 Volkswagen Passat is 4 ft. 9.6 in. (57.6 in.).