Sticky EGR valves are another DPF killer - pumping excess crankcase vapour into the exhaust. Faulty glow-plugs - also DPF-deadly - because they cause the engine to run too rich on start-up. PRESSURE SENSOR. And then there’s the differential pressure sensor across the DPF - all that does is measure the pressure drop across the filter. There are three solutions available to solve Ford Ranger DPF issues. I will go through each one; Option 1: Regeneration . This is probably the cheapest solution. A mechanic with a diagnostic tool can put the vehicle into regeneration mode for the car to clear its soot by itself. The problem with this solution is that it is short-term. Tony Dyson. For clarification, the iCarsoft MBII does not provide a manual regen facility for the DPF. The iCarsoft MB V2.0 does and requires a current DPF fault code to be active before the manual regen function will become available. The MB II and MB V2.0 are two different spec'n instruments. It also regenerates actively (by introducing extra diesel to start a fire in the DPF) every 250 miles or so. But if the DPF is too clogged with soot, the active regeneration cannot take place and the extra fuel dribbles down the bores contaminating your lube oil and raising its level. Decent superfuel such as Shell V-Power Nitro Plus helps (I The DPF can start regeneration in a couple of ways, but both need the exhaust gases to get extremely hot – usually around 500 degrees Celsius. As a result, diesel cars aren’t particularly Saw the regen trial kick in, pressure difference went up by about double and the exhaust got quite throaty and rumbly. About 3-5 miles down the road the DPF last regen mileage went to 0.0 and everything went back to normal. It's definitely a much happier car after a regen. When the pressure sensors tell the ECU the DPF is getting clogged or full of Soot. The ECU will start a regen cycle IF the vehicle meets the min speed required of 30 mph. At that time the ECU will spray fuel into the exhaust and that will cause the temperature in the DPF to rise high enough to burn off the Soot. 2 Answers. When a diesel ECM detects a pressure differential before and after a DPF, and if that differential exceeds a certain threshhold, it will begin a DPF regeneration as soon as exhaust temperature, speed and load conditions allow. That threshhold occurs when the DPF is nearly "full". For one of my vehicles, the threshhold is at 80% "full". ND0pG.