Just spoke to the guy who took the tests. The sensor is a secondary problem really and they could be related.
I'm going to try and clean the EGR valve. I have been told that this is quite a lot of work and means taking off the inlet manifold? The guy I spoke to suggested that the inlet manifold and EGR valve are replaced. He reckons it's the early signs of an EGR failure and that it's sticking open occasionally.
I'm a bit of a novice when it comes to cars but have done bits and pieces in the past, pads, discs, alternator etc.. So hopefully it isn't too big a job??
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