Okay, my first thread and read lots of discussion on P207F & P20EE; here's the issue. Driving from MS to FL on I-10, got a CEL, pulled over read with my OBDII scanner and the dreaded P207F & P20EE. Looked up online to see what these were, cleared the faults and got back on I-10 and immediately got the exhaust fluid system fault and speed limited to 50 mph in 50 miles. Pulled off at the next exit and dumped 3+ gals of DEF in the tank, so it wasn't empty. Read for codes again and only 207F was there and 20EE never came back and cleared code. System would reset and come back during the whole drive. After stopping and shutting down at a rest area in FL (which I was afraid to do), now I was limited to 50 mph and then idle only when I was attempting to accelerate and get back on I-10. Pulled way over and sat there for over an hour trying to get 207F and speed restriction to clear before it finally allowed me to continue to drive at highway speed. After some reading, replaced the upstream and downstream NOx sensor, topped off the DEF (may have been a bad idea) and I couldn't check quality level of the DEF (don't have the instrument), but it was new. Ordered a ThinkDiag scanner, but it didn't work and returned it and ordered the ThinkTool Mini, which would arrive in a week so I could perform a static regen. Drove the truck and the dynamic regen started and I monitored it by verifying the mpg dropped from 16 mpg to 8-10 mpg and it took about 30 mins to run during my drive at 70 mph. Got the ThinkTool in the mail, 207F still popping up, clear DTC, performed the static regen without a hitch (20 mins or so) and then went to do the reductant injector clean. However during the reductant injector clean, the reductant pump duty cycle and reductant injector duty cycle never moved from 0.00% (pics included), but the reductant line pressure read good, it went completed the 1st cycle and when the 2nd cycle began, the rpm never increased during this cycle - stopped the cleaning cycle. Checked the ohms on the reductant injector and it was at 12 ohms and it had very little deposits on the nozzle and injector. Cleaned it up, reinstalled and still the same issue with the reductant injector cleaning function 2nd attempt and it would only increase rpm once after the 2nd cycle would begin, same as the first attempt. Thoughts and recommendations appreciated! Thanks
-Rob
2016 F250 Lariat
186k miles




Injector and pump duty cycle stayed at 0.00% during cleaning cycle

 

Welcome to FTE.

If you think it will help assist you, I can move your post to the 6.7L PSD engine forum.

 

Stuart, anything will help and thanks.
-Rob
Retired USN Chief