another EGR thread...
ive been throwing code p0401 and p0402 for some time now. ive done much searching in the forums, and can't seem to figure out the issue. i've replaced the DPFE and EGR, and still have "insufficient EGR flow."
from a recommendation here on RF, i put some cheapo engine cleaner in the fuel tank, and it actually fixed the problem. however, that doesn't work anymore, and my truck won't pass inspection until i can fix it.
im guessing the lines are plugged up with carbon, and i think the next step is to clean the hoses, but im not sure which ones.
if someone can point me in the right direction for cleaning out the hoses, or offer a better suggestion, that would be great, thanks!