I had dpf replaced about 115,000 miles ago, little under a year. I've had to do 2 regens, 4000 miles apart in the last two weeks. Is it time to have it cleaned?
2 in 4000 miles isn't bad. If you find they become more and more frequent and you need to do one every day or so, then it is time to get them cleaned. You need to clean the DPF, DOC, PreDOC and the injector.