Driving along (Golf MKV 2.0 FSI) when suddenly oil pressure warning light comes on. Keep going for a little while but pull over when light stays on.

Check the dipstick, oil level is fine.

Keep driving but warning light is still on.

Get home, check dipstick again, level fine again.

Remove oil filler cap, was very tight but comes off. Screw it back on.

Go for a drive and all good, no warning light. WTF? How removing and replacing oil filler cap can fix this issue is beyond me.

I've now had this happen twice (in two weeks) so can't put it down to just one of those things .....