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D13 doing forced regens every 500 miles (New NOx sensors already)
Looking for some diagnostic help. My Volvo D13 is calling for a parked regen almost every 500–600 miles. I already replaced both the inlet and outlet NOx sensors last month thinking that would solve my emissions gremlins, but the frequency hasn't changed. The DPF filter was baked and cleaned about 80k miles ago. What else should I be looking at that would cause the filter to load up with soot this quickly? Seventh injector/hydrocarbon injector issues? Thanks in advance.