Diesel Particulate Filter (DPF) Urban Regeneration Failure
SeriousExhaust & EmissionsOn 1.3-litre MultiJet turbodiesel models, the diesel particulate filter requires sustained high exhaust gas temperatures to burn off accumulated soot. Because many Qubos are purchased as town runabouts or Motability mobility vehicles undertaking repeated short trips under 3 miles, the engine never achieves active regeneration criteria. Soot accumulation triggers warning lights, engine oil dilution from unburnt post-injection diesel fuel, and limp-home mode.
DPF warning light or yellow 'Check Engine' light illuminated on the instrument cluster, Engine oil level rising above the 'Max' mark on the dipstick due to diesel fuel wash dilution, Noticeable loss of engine power with throttle response limited to limp-home mode
- Inspect the engine oil dipstick to ensure oil level is not suspiciously high or smelling strongly of unburnt diesel fuel
- Verify with the owner whether the car has completed weekly 20-minute 50mph+ dual-carriageway journeys
- Check for recent diagnostic records showing forced DPF regeneration or sensor replacements