Cranking but not starting - Intermittent

[Psmith67]

Hi

I have a MY2020 1.2 Puretch 5008 that intermittently will crack (turn over) but not start unless I switch everything off, exit car, lock then unlock car, enter again then starts!

I have replaced key battery, new spark plugs and cam sensors but no change. Battery also has full charge and is healthy.

This happens randomly.

Anyone with an idea what might be wrong?

[wurlycorner]

That wouldn't be related to spark plugs and likely not cam sensors either.
Have you had a diagnostic reader on it to see if any DTC's stored, or to monitor signals while cranking? (fuel pressure, cam/crank signal etc.)?

[PaulC5]

When it does this, before going through the door locking process, if you leave the key in the ignition and open the door does it give a warning - if not then the immobiliser might not be recognising the key sometimes. Does it also happen with the spare key ?

[Psmith67]

Thanks for replies.

No DTC codes at this time or later. Did have a DTC about a month ago which was P11A9; cleared, changed Cam sensor and nil since.

Alarm sounds when open doors with engine running. Unfortunately no spare key

Whilst it is intermittent it is random too.