This time no limp mode but code p2459 diesel particulate filter regeneration frequency not OK. This was reset and lasted 500 miles before the same issue of dpf flashing. It was due a service so I've had that done, although another 180 miles after the recent fault was reset and 15 miles after the service the dpf is flashing agian. As explained above there are factors causing DPF failure. If not addressed the method of regeneration will not work. For people in 3rd world countries, regeneration may not work as desired because they cannot change their quality of fuel. Option 2: Buy New DPF – If Option 1 has failed the next option on the table would be to buy a new DPF Inserting passive regeneration in the active regeneration interval is conducive to reducing the frequency of active regeneration, which is friendly to fuel consumption (E et al. 2019a). It is worth noting that the use of NTP technology in DPF is becoming popular recently. Works for my Zafira 2.0 CDTI, providing it is kept above 2500 RPM. That said, Since I started using Shell V-Power about 3 years ago and that made a MASSIVE difference to the regeneration frequency. Before that she was getting us to do a forced regen every 2-3 weeks, then after we started using V Power we maybe get one every 4-6 months. DPF Active regen. Hello Everyone, I'm new to the forum, I have a Mazda 6 2.2 diesel I am having some problems with frequency active regens of the dpf does anyone have any advice? My car does this every 60 - 80 miles (every second day), I am in talks with Mazda and they have tried.egr cleaning, injector relearns but this hasn't helped and @mareng, do you maybe know, why from time to time after regeneration almost ends, pm_gen from 0 jumps to 1 and then regenerations stops. Pm_gen after few minutes drops to around 0.4,and this is it. Its a strange software glitch which I noticed even with 2.2 R2 motor in my previous mazda 6. Although this is a very short distance, that indicates that regeneration frequency is of paramount importance in assessing vehicle emissions compliance towards the regulatory limit. 4. Conclusions. The present work assessed the effects of DPF regeneration on emissions of a diesel Euro 6 d-temp car under real driving and laboratory conditions They drove it around town for like 10 miles and would call back saying they couldn't duplicate. The last time i picked it up it started a regen and the check engine light came on. I took it back and they pulled code P2459 (DPF regeneration frequency) they brought it back in and said well you only have 8% oil life left and that must be why. The Edge CTS dispays parameters that the PCM monitors. One of those is SOOT % Ford must have some sensor that measures the soot collected and triggers the regens when that concentration is reached. The 6.7 will do either a Passive Regen ( anytime you have exhaust heat over 572*) and the Active Regen when the percentage triggers it. Somewhere. Mar 11, 2021. #8. Several things can cause frequent regeneration. Low exhaust temps, exhaust leaks, intake leaks, low boost pressure, clogged egr differential pressure sensor and or port . Failing or clogged dpf differential pressure sensor. If this machine runs def you can have def crystals clogging the pipe. 13L6St.