hi all haveing a nitemere with my cdti 150 basically the exhaust as started blowing and the garage is certain it needs a new dpf and thats the blowing. but would it cause the light to come on and go in limp mode(i know it will seriously hamper performance), i know theres a few ways round not haveing to buy a new 1 just wanted to see if anyone else had a similar thing happen and that im not beong ripped thanks again.