Lil'Trucker! 23576 posts · Joined 2007. #2 · Oct 30, 2009. Hi mate, hopefully NissanTechy will be able to answer this for you, but this is what i would try: Disconnect the battery for about 10 mins, then start the engine, let it tick over for about 5 mins, then switch off and do the ECU reset, and see how it goes. Yesterday I got a warning message 'DPF malfunction' along with the warning triangle light. The book naturally says - consult a Mazda dealer. But as I'm in Spain at the moment I was trying to determine if there are any options. The car is performing perfectly (no reduced power) and was serviced about 2500 miles ago. Oil level is also fine. Dpf, it is not clogged. 1.service, lambda probe.2 service we have to do an investigation because we do not know.(found that there is pressure on the DPF) 3 service, we will rinse the DPF chemically and then look for further. The Isuzu DPD (Diesel Particulate Diffuser) also referred to as a DPF (Diesel Particulate Filter) was first introduced to the Isuzu truck range in 2007 in order to meet Euro IV emissions standards. From 2011 to 2016 the system was retained with slight ‘improvements’ to meet the stricter Euro V standard. Trucks built 2016 onward are running Engine light on DPF light on, a couple of problems with them when don’t have proper service on the vehicle. Service interval is 12500 Miles or 12 mouth. P252F fault code engine oil level too high is calculated with engine ECU, not with a sensor that comes when not reset after service or has any problems with DPF or other system. Carefully inspect the sparkplug wires and all of the boots for any cuts, tears or signs of arcing. Use some dialectric grease to slick up where the boots slip over the plugs and the high tension leads slip onto the coil. Clean the plugs, recheck the gap and swap them around too. Keep track of what plugs went where. Turn on the vehicle’s ignition. (Engine OFF) 6. Press the accelerator to the floor and release 5 times. 7. Glow plug warning lamp will flash 5 times when reset is complete, if not got to step 2 again and repeat till the Glow Plug illuminates 5 times. 8. The DPF light and engine light as well as the traction control light coming on indicate a fault is detected with one of the DPF components. This is the diesel particulate filter system. This can be due to the filter itself being clogged up needing to be cleaned or replaced or an issue with one of the DPF sensors. zgY4yy.