Just bought myself a 2002 model A2 TDI in January, and I'm mostly pleased with the performance.
The exception is the general noise level, especially when reaching around 2.0 on the rev counter. At that time, there's a mid-low frequency noise. Almost sounds like I'm driving a V8, and most noticeable after speeding up and the letting go of the gas pedal. It seems to be a result of vibrations tuning out the sound from some partially loose component or something, but when I sent the car in for a check-up, they didn't find anything wrong with the vehicle.
The problem seems to be most apparent on colder days, and gets a little better after driving for a while. Naturally, the problem may lie somewhere else, but as I'm not especially well gifted in regard to cars and their components, I'm hoping to perhaps get some pointers from the audience
I had a problem like that recently, Audi put some grease on the Drivers side bonnet fixing (where the bonnet locates near the window). There seemed to be a little bit of play, and with my TDI engine the vibration could be heard inside while accelerating near 2000 rpm.
Audi also did a few other things during the service and its possible that removing something else cured it, But its a cheap option to start with!
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