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I am seeing weird shit too. Cascading faults you might call them. In recent memory an EGR cooler gets replaced and within a couple thousand miles trucks come back with a P207F that ends up being the filter. The pinpoint tests have been updated but they are time consuming. The first thing that pisses me off is they have you get the truck hot by performing the DEF injector clean procedure... then go ahead and pull the injector off and do the leak test... flow test and take a sample of the fluid. Really? After a good visual inspection the first thing I do is unbolt the injector, do a flow and leak test and obtain my sample. From there I can circle back and follow the tests with out having to stop for a cool down... unless I find the problem there.
I've been doing my share of DEF tank heaters here as well. Both on F-Series under the campaign, and on Transits as well. I especially like doing the ones on Transits because most of them have been out of warranty.
Hour count was high.
Problem was in the lower intake manifold, in the mixer, where the hot exhaust and cold air meet. Was plugged, causing the code.
The pinpoint test does not address this, said everything is normal.
In the older trucks, where you check the flow through the egr cooler and monitor maf while cycling the bypass, the maf would be steady, in the mid 30's. With a plugged cooler, it would read mid 30's and mid 50's depending on the bypass position. I was getting high 50's all the time regardless of bypass position. This tells me there is a exhaust restriction downstream of the cooler and the next logical place is in the mixer.
After removing the lower intake and cleaning it, my reading went back to normal and the codes gone.