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Has this filter ever been pulled off and been baked? Do any other codes come up when the truck comes in for the issues? usually when the DPF system acts up, as far as sensors or doser, it will code out and not let you even do the parked regen on it.
I asked about getting the filter pulled and baked is because there may be too much soot caked in the waffle cones in the center of the filter. What we will do is pull the filter and have it cleaned in the filter machine, then flip it and install it the opposite way it was in there. Mitsubishi recommends this when you reinstall the filter after it is in the baking machine to blow out the remaining soot. If you don;t have the machine, then run the regen, let it cool overnight, then drop the filter, flip it, and then put back in to see what it does. It may have soot trapped in it that is hard and will not blow out. If that happens, the filter will need to be replaced. We get a few in that we have to replace, but usually flipping them will blow out the larger chunks of the ash and it does fin for awhile.
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