Most people will know that these vehicle suffer from DPF issues, i have heard every thing from the 5th injector to the way the vehicle is driven.
so anyways finally had the chance to look at a vehicle that has 100,000kms on the clock and it is doing what every one else has been taking it back to toyota for.

So being us here we took a look drove the vehicvle around and checked the live data, the vehicle does go into a regen and it finishes, cool system operational.,

the differential pressure builds back up too quickly for my liking, – Leaky Diesel Injectors, as we know they are worn a 100,000kms.
but i wasnt happy just with that so i decided to puit a camera down in the temp probe holes and see whats happening,

heres what i saw:

1. the entry into the cat was blocked all around the outer diameter the holes being blocked.
2. the temp probe #2 dirty and the DPF differential pipe was blocked – dusty carbon had blocked the hole
3. the temp probe #3 was clean
4. going back to the #1 temp probe i turned the camera to see what else was there and i noticed, that the way the outlet from the turbo comes out in the turbine wheels diameter and then all of a sudden the pipe opens to DPF / Catalyst Diameter ( FAIL )

This is where i hit the Nail on the Head and relaised that the way air velosity works when the exhuast rushes from the smaller diameter to the larger on the outside diameter air will slow down way to quick and in thaty event will loose speed and Heat.

What im saying here is Toyota Knew they made a few million of these things and installed to a shit ton of 1GD Engines all around the World. it was going to cut too much to recall every dpf and change the exhuast gask velocity of the turbine outlet by modifying the diameter change rate

but im thinging of a solution to cut the front of the nose off and weld in a steel insert to fill the low pressure cavity to speed up the exhuast gas into the outside diameter of the catalyst and that should stop these vehicles failing.

BLoody BINGO Dickheads

More research was done after my initial checks on the class action and the links and results are below ill leave my comments here too.

There is a class Action which they lost on, but it doesnt really tell you what is wrong

So in the modern age i decieded to copy and paste the contents into Open AI and ask for the answer rather than me reading it to start with, here is the answer i got

OPENAI – Question >

READ THE FOLLOWING AND TELL ME WHY THE DPF SYSTEM FAILS
Questions Common to Group Members
References below to paragraphs of the reasons for judgment delivered by Justice Lee on
7 April 2022 (Reasons) and the reasons for judgment delivered by the Justices Moshinsky,
Colvin and Stewart on 27 March 2023 (Full Court Reasons) are included for convenience
only and do not, and should not be understood to, limit the Reasons or the Full Court
Reasons.
The questions of law or fact common to the claims of the group members, and the answers to
those questions, are:
Characteristics of the Relevant Vehicles

1. Throughout the Relevant Period, was it the case that:
   (a) the DPF System in the Relevant Vehicles was not designed to function
   effectively during all reasonably expected conditions of normal operation and
   use in the Australian market, including the High Speed Driving Pattern;
   A: Yes: Reasons, [15(6)], [15(7)].
   (b) in the event that the Relevant Vehicles were exposed to the High Speed
   Driving Pattern or the Earlier Countermeasures the DPF System was
   ineffective in preventing the formation of deposits on the DOC surface or
   coking within the DOC, which in turn prevented the DPF from regenerating
   effectively;
   A: Yes: Reasons, [15(6)], [15(8)].
   (c) if the Relevant Vehicles were exposed to the High Speed Driving Pattern
   and/or the Earlier Countermeasures:
   1.c.1 the DOC became blocked by deposits forming on the face of the DOC;
   1.c.2 regeneration events failed to remove sufficient particulate matter from
   the DPF to prevent the DPF from becoming or remaining ‘full’ or
   blocked;
   1.c.3 the DPF System failed to prevent the DPF from becoming ‘full’ or
   blocked;

• 4 –
  Prepared in the New South Wales District Registry, Federal Court of Australia
  Level 17, Law Courts Building, Queens Square, Telephone 1300 720 980.
  1.c.4 the DOC and DPF did not function effectively;
  1.c.5 the catalytic efficiency of the DOC was diminished;
  1.c.6 the exhaust in the DPF did not reach a sufficiently high temperature to
  effect thermal oxidation;
  A: Yes: Reasons, [15(8)].
  (d) if a Relevant Vehicle was exposed to the High Speed Driving Pattern, the
  Relevant Vehicles would experience one or more of the following
  consequences by reason of the Core Defect:
  1.4.1 damage to the DOC;
  1.4.2 the flow of unoxidized fuel through the DPF and the emission of white
  smoke from the vehicle’s exhaust during and immediately following
  regeneration;
  1.4.3 the emission of excessive white smoke and foul-smelling exhaust from
  the vehicle’s exhaust during regeneration;
  1.4.4 partial or complete blockage of the DPF;
  1.4.5 the emission of foul-smelling exhaust from the exhaust pipe when the
  engine was on during and immediately following Automatic
  Regeneration;
  1.4.6 the need to have the Relevant Vehicle inspected, serviced and/or
  repaired by a service engineer for the purpose of cleaning, repairing or
  replacing the DPF, the DPF System (or components thereof);
  1.4.7 the need to have the Relevant Vehicle inspected, serviced and/or
  repaired more regularly than would be required absent the Core Defect;
  1.4.8 the need to programme the ECM more often than would be required
  absent the Core Defect; or
  1.4.9 the display of DPF Notifications on an excessive number of occasions
  and/or for an excessive period of time;
  1.4.10 blockage of the Additional Injector due to carbon deposits on its tip;
  1.4.11 the Additional Injector causes deposits forming on the face of the
  DOC, causing white smoke; and
• 5 –
  Prepared in the New South Wales District Registry, Federal Court of Australia
  Level 17, Law Courts Building, Queens Square, Telephone 1300 720 980.
  1.4.12 an increase in fuel consumption and decrease in fuel economy.
  A: Yes: Reasons, [59].
  (e) by reason of the fact that the Core Defect was present in each Relevant
  Vehicle at the time it was supplied, each Relevant Vehicle had a propensity to
  experience one or more of the Defect Consequences;
  A: Yes: Reasons, [62]-[63].

1. Were all Relevant Vehicles subject to the statutory guarantee as to acceptable quality
   in s 54(1) of the Australian Consumer Law?
   A: Yes: Reasons, [155], [162].
2. Can the question of whether the Relevant Vehicles were not of acceptable quality
   within the meaning of s 54(2) of the Australian Consumer Law be determined on a
   common basis?
   A: Yes: Reasons, [212]; Full Court Reasons, [51].
3. Were the Relevant Vehicles not of acceptable quality within the meaning of s 54(2) of
   the Australian Consumer Law?
   A: Yes, the Relevant Vehicles were not of acceptable quality within the meaning of
   s 54(2) of the ACL: Reasons, [173]-[213]; Full Court Reasons, [65].
4. Was the 2020 Field Fix effective in, and will it continue to be effective in, remedying
   the Core Defect and its consequences in all Relevant Vehicles to which the 2020 Field
   Fix has been applied?
   A: Yes: Reasons, [15(10)].
   Vehicle Representations
5. During the Relevant Period, did TMCA represent to the public at large that the
   Relevant Vehicles:
   (a) were, or were part of model lines that were, in their design and manufacturing:
   6.a.1 not defective;
   6.a.2 of good quality;
   6.a.3 reliable;
   6.a.4 durable;

• 6 –
  Prepared in the New South Wales District Registry, Federal Court of Australia
  Level 17, Law Courts Building, Queens Square, Telephone 1300 720 980.
  6.a.5 suitable for use in any driving environment; and
  (b) provided, or were part of model lines that provided, a driving and/or passenger
  experience that was comfortable?
  A: Yes: Reasons, [215(1)(a) and (b)].

1. Was each Vehicle Representation made continuously by TMCA throughout the
   Relevant Period?
   A: Yes: Reasons, [217]

OpenAi’s Answer >

The Diesel Particulate Filter (DPF) is a component often found in the exhaust system of diesel vehicles to trap and remove harmful particulate matter before it is released into the air. However, there are several reasons why the DPF system may fail:

1. Lack of proper maintenance: If the DPF is not regularly cleaned and maintained, it can become clogged with soot and other particles, reducing its effectiveness and eventually leading to failure.
2. Short driving trips: DPFs require regular high-temperature regeneration to burn off the trapped soot. If a vehicle is used primarily for short trips where the exhaust does not reach high enough temperatures, the DPF may not be able to regenerate properly, leading to failure.
3. Faulty sensors: The DPF system has sensors that monitor the temperature and pressure within the filter. If these sensors are faulty or malfunctioning, they may not trigger the necessary regeneration process, leading to DPF failure.
4. Low-quality fuel: Using low-quality or contaminated fuel can result in increased soot production and buildup in the DPF, causing it to become clogged and leading to failure.
5. Mechanical issues: Other mechanical problems with the vehicle, such as a leaking exhaust system or a faulty EGR valve, can impact the effectiveness of the DPF system and cause it to fail.

I didnt like that answer as it didnt uise the document to find the answer so i asked again.;

OpenAi’s Answer >

I apologize for the confusion in my previous response. The specific reasons outlined in the text provided for the failure of the DPF system in the Relevant Vehicles include the fact that the DPF system was not designed to function effectively under certain driving conditions, such as the High Speed Driving Pattern, and that exposure to this pattern or earlier countermeasures could lead to the formation of deposits on the DOC surface or coking within the DOC, which in turn prevented the DPF from regenerating effectively. Additionally, the Core Defect present in each Relevant Vehicle led to various consequences such as damage to the DOC, blockage of the DPF, emission of white smoke, and decreased fuel economy. Despite the attempt to address these issues with the 2020 Field Fix, the Core Defect and its consequences were not effectively remedied in all Relevant Vehicles. These factors ultimately led to the determination that the Relevant Vehicles were not of acceptable quality under the Australian Consumer Law.

thats more like it, But Toyota didnt really explain what they fucked up on in the design and admit liability,

That is all took Me about 3 Days to Work it out, what i used.
1. 25 years of experience.
2. Scan Tool and live data
3. A Camera / bore scope to get into the small holes, with out removing the dpf from the car.
4. and a Passion for learning why the Fault presents its self over a long period of time.

SIMPLES