56 reg Mk5 Golf 1.9 tdi died, then OK

[Barkychoc]

A friend at work was driving his golf across a mini roundabout and it just died. It woudn't restart as if the battery was very low, trying to turn over but failing. Left it 10 minutes started straight away and hasn't done it again since it happened yesterday.

Any ideas?

[s3londonuk]

I had a similar problem with my old Golf diesel but it was much older being a '98.

The fix was quick and cheap - change relay 109.

However this was on the older engines, not sure if it it's relevant here but worth looking into as it only cost me £12.