Toyota Australia has agreed to settle the two class actions over the diesel particulate filters (DPFs) in its HiLux, Prado and Fortuner for AU$750 million, subject to Federal Court approval. The timing isn’t subtle. Both the Williams and Taylor cases were listed for a two-week hearing starting 19 October 2026, where a judge would have worked out exactly what Toyota owed. Toyota chose to name its own number first.
That number caps a dispute that’s seven years old and, on liability, long since decided. Toyota lost at trial, lost at the Full Federal Court and lost at the High Court. All that remained was the bill.
What actually broke
The case covers 264,170 HiLux, Prado and Fortuner models with the 2.8-litre 1GD-FTV or 2.4-litre 2GD-FTV turbo-diesel, acquired between 1 October 2015 and 23 April 2020. A DPF traps soot and periodically burns it off, a process called regeneration that depends on sustained exhaust heat. An independent referee’s report, adopted by the court in October 2020, found the system wasn’t designed to work effectively in normal Australian use and had both mechanical and software defects (class action updates). Regeneration didn’t clear enough soot, filters clogged, and owners got foul-smelling white smoke (unburned diesel) plus repeat trips to the dealer.
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The most damning detail sits in the catchwords of the original Federal Court judgment: the problems showed up under normal highway driving. That’s the condition a DPF should thrive in. A diesel ute that can’t clean itself on a long highway run, in a country built around long highway runs, isn’t a niche failure.
The referee also found Toyota’s earlier countermeasures were ineffective and sometimes made things worse. The fix that actually worked, the “2020 Field Fix,” rolled out from May 2020. A later supplementary report found it effective, and also concluded the defect increased fuel consumption.
Why the money got complicated
In April 2022, Justice Michael Lee found the vehicles weren’t of acceptable quality under Australian Consumer Law, that Toyota engaged in misleading conduct, and that the defect cut each vehicle’s value by 17.5 per cent. The Full Court cut that to 10 per cent in March 2023.
The High Court ruling in November 2024 rejected Toyota’s central argument that a later fix wiped out the loss, and said the cut to 10 per cent shouldn’t have happened. It still sent the case back so damages could reflect the fact that a fix existed by trial. It also held that owners who sold their vehicles lost reduction-in-value damages, though they could still claim consequential losses.
That ownership rule is why there’s a second case. The Taylor proceeding covers people who bought an affected vehicle privately, second-hand, between 24 April 2020 and 31 July 2025 and still own it.
The arithmetic
Divide AU$750 million by 264,170 vehicles and you get about AU$2,840 each. That’s before legal costs, the funder’s commission, and the fact that not every eligible owner registered. For comparison, the representative applicant’s reduction-in-value damages alone came to $7,474.59 under the 2022 orders. Gross figures aren’t payouts, and nobody has published a distribution method yet.
At group level, the scale changes completely. In its FY2026 annual filing, Toyota Motor Corporation described the probable outflow from the case as “immaterial” to its consolidated finances. It hurts in Melbourne; in Toyota City it’s a rounding error.
What owners and buyers should do
The registration deadline was 4pm on 26 August 2026, according to the plaintiffs’ updates. Group members who didn’t register are still bound by the outcome but may get nothing, and the settlement terms may bar later claims over the same defect.
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If your vehicle never received the 2020 Field Fix, there’s a catch. The plaintiffs’ lawyers warned that Toyota would argue repaired owners forfeit reduction-in-value damages. Check with them before booking the repair, then get it done. A DPF that keeps choking only gets more expensive. The smell at the lights is the cheap part.
If you’re shopping for a 2015–2020 diesel HiLux, Prado or Fortuner, ask for dealer records confirming the field fix was applied. An unfixed vehicle risks ongoing regeneration trouble, and any reduction-in-value claim belongs to whoever owned it during the claim period, not to you.
Toyota Australia’s class action page carries the current court orders. The approval hearing will decide how much of the AU$750 million reaches owners after the lawyers and the funder take their cut.
If you registered, what did your ute go through before the 2020 fix, and does roughly AU$2,840 a vehicle, before costs, cover it?