Hi

I'll start by saying and apologising that I'm not very good on cars so please go easy on me, but any thoughts/ideas would be much appreciated.

Quick history - A6 Avant late 2005. Just reached 100k miles. Until recently never had any serious issues. At the start of the year for the dreaded white smoke which was indeed the injectors. Had all 6 of those replaced as well as the fuel and oil filters back in early May - running perfectly since then....until yesterday.

The Problem - Wife driving the car (so details are a little sketchy) but steady driving at around 60mph, decelerating gently, she experienced light shuddering. In continued "light" driving in the next 5 mins the shuddering got worse until she stopped at a roundabout and couldn't move off from it at all. She thinks it did rev a little but not much when she tried to accelerate. She turned car off and tried to start again but car wouldn't start - she thinks it didn't turn over at all. 2 guys pushed her car off the road. 5 mins later she tried to start it and it started fine - she managed to drive home with no problems.

I tested the car yesterday evening for about 20mins including some hard acceleration - no problems at all. This morning I turned on engine and orange engine warning light is now on.

When I look up loss of power on the forums there seems to be loads of possible causes. Wondering if anyone had any thoughts. Is is likely/unlikely to linked to the change of injectors in May? If not what are possible causes? I'm bring it down to the garage shortly but just love if anyone had any pointers to discuss with them when I go.

Thanks v much.