dirtcocrossett

i asked my mechanic and he said he isnt sure if he has that zero'd ouy or not. he asked how do you do that?

we have put new switches, sending units, turbo, actuator, muffler and so much more on our 2009 Mack. MP8 Engine. it will regen but then says dpf system fault Dpf system service required. we cleaned the filters and everything possible. we plugged in the tech tool to see what codes we could clear on the computer. we cleared the code. as soon as we done that it turned around and the same code come right back on. we are stumped!!!! Any help or ideas?????????????