Hi, Ive noticed that now and again my 2.0 tdi a3 will idle slightly erratically. Only really noticeable when sat at lights and the car will shake slightly. It only does it now and again.
When I had it remapped, the bloke looked to see if it had thrown any codes, and it had thrown something to do with glow plug number 4 circuit failure, although this could have been an old code.
Speaking to a friend, he seems to think the fault has nothing to do with the problem i've got and it's a possible sticking egr valve.
Anyone got any ideas?