After numerous garages failed to sort the problem I took it to a man I found on Facebook, it turned out it was a computer problem. I think he rebooted the system and cleared the fault and I haven’t had any problem since. If you live near the Sheffield area I can give you his name. I was also advised not to use cruise control anymore as this adds to the problem.
 
	 
 
	Hi Sean
 
	Could you please let me know the name of the guy in Sheffield.  I live in Ripley, Derbyshire so not too far away from Sheffield.  I have had numerous diagnostic checks (no fault showing), no excessive soot, tried regens and an oil change but still the warning light is on.
 
	Thanks, Alison