I just had some repairs to defective paintwork by a professional body shop on my 5-year-old Audi A4. Since getting the car back, the self-levelling Xenon headlights initially adjust when I turn the lights on but stay low, and do not adjust any further with car movement. The body shop told me they had to take the car to a local (non-Audi) dealer after refitting the headlights to get a number of error codes cleared (£50). I had a similar problem with a 2004 A4 some years ago after the headlights were refitted, and the Audi dealer could find nothing - "no fault found" after multiple unsatisfactory visits. Not an experience I want to repeat. Your advice on the fault would be appreciated, as in light of past Audi experience I am expecting problems.