Last week my emission control light came on had it booked into dealer for diagnostic but day before car went in the light went off. Phoned dealer to cancel they said unless light comes back on their is no point booking it in. Today light has come back on again car drives as normal no loss of power ext any ideas what this could be its a edition 150 4 x 4 diesel. Or is it a trip to the dealers to try and find the problem.

So had the car scanned with vcds its the differential pressure sensor thats faulty going into garage for fix tomorrow.