It should be. The extended warranty specifically states sensors, valves and actuators related to the emissions system are covered. If you’ve had any part of the fix done, you’re covered. If you haven’t had fixes done yet they could require you to fix it before modifying the vehicle but since this is an emissions component that would otherwise be covered, I don’t see why they’d give you grief over it.Had a CEL come on and fault codes seem to point to DPF bank 1 sensor. Would this be covered under the extended warranty VW after the fix was performed.