Perhaps this is not the place to post this but here goes.
The fault showed up 3 times today despite the clip test and reset(?). I've checked to see correct plugs put in at last service (3k miles ago), i noticed that the one I took out of cylinder 1 was a bit sootybut that was not after a run, the service also included air filter(would a non Ren type cause a problem?). I suplied the
Castrol high mileage (not a good choice so I've been told, may change it to Amsoil 5w-40)
What sensors should I be thinking of replacing if all else fails. The fault includes ESP but can't see the connection. Any advice gratefully recieved.