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DPF

Diesel Particulate Filter

DPF is the exhaust component that traps soot from diesel combustion. DPF blockages are the #1 reason a 2010+ diesel needs an expensive workshop visit — particularly on utes used for short urban trips. Verify DPF service history before buying any modern diesel.

A Diesel Particulate Filter (DPF) is an exhaust component fitted to all 2010+ Australian-market diesel vehicles to reduce soot emissions. The filter periodically performs a "regen" cycle that burns off accumulated soot at high temperatures.

The regen cycle requires sustained highway driving (typically 20+ minutes at 80+ km/h) to reach the necessary temperatures. Vehicles used primarily for short urban trips never complete the regen cycle — soot accumulates, eventually triggering a "DPF full" warning and requiring a workshop forced regen ($200-400) or in worst cases a DPF replacement ($2,000-5,000).

Why this matters when buying a used diesel

The most popular AU dual-cab utes (Ford Ranger, Toyota HiLux, Isuzu D-Max, Mazda BT-50) are commonly bought as second cars for school-run / short-trip use. These vehicles often have unaddressed DPF accumulation that becomes the buyer's problem.

Verify before buying:

  1. Service history shows DPF cleaning has been performed (typically $300-500 at a Toyota/Ford/etc. dealer).
  2. No DPF warning light is on at cold start.
  3. Take the vehicle for a 30-minute highway drive during the test drive — if the regen cycle triggers (you'll feel a slight power reduction and see the DPF status indicator activate), it's a sign the previous owner wasn't completing them.

The Aussie Car Check Comprehensive report ($29.99) flags any factory recall or service bulletin related to DPF for the specific make/model — many manufacturers have issued software updates or extended warranty actions on DPF components.