Hi, this is a strange one, A6 allroad auto in for cambelt/wpump/thermostat, all goes ok. Car comes backwith following fault: every now and again ABS ans Traction light oh and air suspension fault. Cant work it out.... vcds says check faults on other ecus, injection is slightly advanced, I knew that, did throw a code. Turns out that because the inj timing was 3 degrees too advanced the engine ecu put faults in 3 other ecus and put into limp mode. Set inj timing to perfect and runs like a dream.