As anyone else had this fault. For a while i have been getting the spanner light on and the dreaded limp mode. When i put the Opcom i get high differential pressure. First i took dpf off pressure washed out, did a regen and was ok for about a week then same fault. I have repeated this process a few times with same result. So i thought sod it and went and bought a new dpf at great cost to bank balance. Low and behold not even a 100 miles and same fault again. I have checked everything EGR, throttle valve for sticking, boost pipes, i have spent hours on here and trying everything that is suggested but to no avail. Has anyone got any suggestions before i go grey or bankrupt.