I have a 3.0tdi quattro Avant that for the last year has sporadically misfired and even shutdown. The engine management light sometimes comes on and when it does it says there is a fault with No6 injector. The injector has been replaced as well as swopped with No4 and the wiring to the injector has been changed right back to the ECU, all without success. In desperation took it to Audi dealer and had an identical ECU (from Ebay) installed and recoded. Problem still persists, still saying No6 injector fault. I'm tearing my hair out. Anyone got any ideas? Car is a 2006 model so I don't want to spend much more on it as it's not worth much, especially with 200,000miles on the clock but when it's working, it's a great long distance cruiser and load lugger. I had 6 months carefree motoring after changing no6 injector but the problems now back again.