I recently posted regarding a diesel particuate filter problem and you guys kindly gave me advice how to sort the problem (giving the car a decent run at high revs) I followed your much appreciated advice. The engine management light is still on on the dash and you did tell me I might have to have it reset. Someone said it might be possible to reset this by disconnecting the battery for 1 hour and then reconnecting. Is this true? I won't do anything until I get professional advice from you guys. I apologise if I come across like a complete idiot but modern engines are so sensitive and computer governed and I am scared that I might create another problem.