My Audi A6 180 Quatro went in for a small body work repair to the front o/s bumber apron bellow the headlight. When i collected it and switched on, the computer read outs were all over the place. The clock was reading the wrong time and the callendar was showing 31.12 1999. Fuel guage was jumping all over the place but eventually settled down. Other read outs were all wrong as well but outside temperature , total running time and remaining miles for fuel in the tank reset themselves. I am still left with no aveage mpg, no actual mpg and no average mph. The odometer and trip meter have both dropped out and the display shows 'dEF'. Also if you put the boot down or just rev it up standing still it pours black smoke. Had a problem for the last month or so with intermittent reading on temperature guage. have relaced sender which appears to have fixed this. Can anyone help? I can't handle all this electronic ECU and engine management !!!. Car still runs well, infact it goes like stink at the moment- so it should with the amount of fuel it is burning but it is a bit embarrasing leaving a black cloud behind you every time you depress the accelerator. Re bodywork - the front apron was only disconnected under the headlight to allow for some local filling. I am not aware of any wiring or sensors in this area that could have caused this. The battery was not disconnected. It would appear to be co-incidental.