How is this done?
I recently replaced the Cat Convertor on the A3 when a rattle noise appeared, note that at the time of the fault there was no Engline light on the dash.
The other day the engine management light came on and I got worried. I scanned the car expecting to find a new fault but I only found the Catalytic fault...(must have forgottent to clear it previously) so I clicked on 'Clear DTCs' and the Engine Managemt light is still on and when I scan the car the fault still pops up..
Any ideas? I didn't even think a faulty Cat would cause the engine management light to come on, but there is no other recorded fault..