Toyota Hilux & Prado Diesel Particulate Filter Problems

An article regarding claims that Toyota Hilux & Prado diesed vehicles were manufactured with faulty particulate filters between October 2015 & July 2019.

An extra $70 a week for fuel? Oh what a feeling, Toyota.


Thanks for sharing @Fred123, I’m sure our campaigns team will be keeping an eye on this one.


Diesel Particulate Filters (DPFs) may not be a Toyota specific problem. There are many reports of other manufacturers fitted with DPFs which also have had problems. Many manufacturer’s also recommend/state that modern diesel vehicles with DPFs should be run hot regularly to ensure the DPFs function properly. Many car owners have problems as they tend not to do high speed highway mileage which I understand allows the DPF to self clean. If they don’t self clean, they become blocked causing a wide range of engine running problems…

John Cadogan, in his blunt style, covered the issue a few years ago…

We looked at buying a non-Toyota diesel passenger vehicle a few years ago, but our independent mechanic advised against it unless we did mostly highway driving. We were told at the time if we didn’t, the DPF would become the Achilles heal of the vehicle.


Another shoe drops.


We considered a Subaru diesel boxer a year or so aftet they were released about a decade ago. We spoke to our independent Subaru mechanic and they wanred against buying any new modern diesel engines (inc. Subaru’s) unless we did a lot of very regular highway driving (which we didn’t). We were told that the particulate filters need ro run hot for a period of time and this can only be achieved a high highway speeds where the engine is a high revs. They also said that if the particulate filter was not regularly cleaned through high temperature, it would become blocked/inefficient and result in engine problems…the cost to rectify would be replacement of the filter which could be expensive

I am pleased we asked questions and took their advice…as we might have been one of tbe owners which have problems through the type of driving undertaken.


Mazda diesels have also had problems with a system put in place to regenerate the filter if it senses not enough high engine rev driving has occurred. Additional fuel is pushed through the injection system however this has seen a number of customers with engine failures as so much fuel bypasses the rings and ends up in the sump.


ABC’s September story on the DPFs:

VW seem to be still a bit head in the sand about their diesel engines (reminding me of the software design) features re emissions as per this “Volkswagen maintains DPFs are unlikely to be a problem if people regularly drive on motorways”…not everyone drives on Motorways or similar high speed roads.


Should we all be concerned for other reasons if these particulate systems are potentially defective?

  • The particulate filters have been added to diesel powered vehicles for a reason.
  • What proportion of diesel road vehicles are there on our roads that do not have any improved exhaust emissions control?

It seems there are recognised risks and a need to ensure they are managed.

For road vehicles in particular.

This article includes numerous links to the current standards and relevant reports to government.

For light duty diesel vehicles, particulate traps are necessary in most vehicles to meet the very low particle emission limits in the Euro 5 standards adopted in ADR79/03 and ADR79/04.

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