To force DPF regeneration, you can use a diagnostic scan tool for a technician-led "static" (parked) or "driving" regen, or some vehicles have a driver-activated "regen button"; the process involves the car's ECU raising exhaust temperatures to burn off soot, often requiring the engine to run at higher RPMs for 20-45 minutes in a safe, well-ventilated area. A simpler, driver-initiated method is a sustained highway drive (80-100 km/h for 30+ mins) if the DPF light just came on, but for heavy clogging, professional intervention with a scan tool is needed.
Regeneration is a process in which the engine is made to run at a high temperature in order to burn off the particles trapped in the filter. This process is usually done automatically by the vehicle, but can also be done manually. Another way to clear a DPF is through a process called forced regeneration.
There are two main types of DPF regeneration: passive and active; however, DPF regeneration can be performed manually using a scan tool.
Typically, a regeneration cycle can take anywhere from 20 to 30 minutes to complete under normal operating conditions. However, in some cases, it may take longer if the DPF is heavily loaded with soot or if the vehicle hasn't reached the required operating temperature for regeneration to occur efficiently.
To manually start DPF regeneration, connect an OBD2 scanner to your vehicle, navigate to the DPF regeneration option in the scanner's menu, and follow the prompts to initiate the process. Make sure the engine is running and all conditions are met.
If your car has an automatic gearbox, change gears in manual mode, increasing the number of revolutions. However, there's no need to go as far as the rev limiter, as that won't do any good. Drive in this mode for at least 30 minutes. This will trigger a regeneration cycle and your DPF will be cleaned.
Top 10 vehicles with DPF issues:
Active regens are initiated by the truck's computer and typically occur while the truck is driving. Passive regens are done while the truck is idling. This type of regen is less efficient than active regens.
Fuel additives are ideal for keeping a filter unclogged from the inside during use and can typically be poured into the filter without removal.
To begin, press and hold the PARKED REGEN switch for two seconds, then release. Note: If the parked regen switch blinks, make sure the truck is in neutral and parking brake is on. The engine will automatically rev up, and the switch will illuminate.
It's illegal to delete or tamper with any part of emissions system Ad Blue, DPF , EGR etc, mot test's are getting stricter, if your vehicle shows these kind of faults on the MOT history it will make it harder to sell, any half descent mechanic/ technician/ MOT tester can find if its been tampered with.
Continuing to force the DPF to regenerate will worsen the problem and cause serious damage. Injector and Turbocharger Damage: Multiple forced regenerations can overload the turbocharger, fuel injectors as well as other expensive engine components with the extreme heat being generated. This can lead to costly repairs.
To regenerate the diesel particulate filter (DPF), it is generally recommended to drive for at least 20 to 30 minutes at a constant speed of 60 km/h or more. This allows the filter to reach the temperature necessary to burn off the accumulated particles.
REDUCE IDLING
Even at low engine speeds particulates are emitted by your engine, so keeping your engine ticking over when you're parked or not moving can clog your filter quicker, because DPF regeneration cannot occur at idle.
For passenger cars, the cost of replacing a DPF can range from AUD 1,500 to AUD 3,000 or more. Larger vehicles like buses and trucks could have significantly higher costs due to the larger size and more complex systems.
Consumer Reports' 2025 Reliability Rankings: The Least Dependable Car Brands
You should consult the handbook for your vehicle for more specific guidance on how you should drive to initiate regeneration of the DPF and clear the warning light. Nevertheless, a general rule of thumb to follow is that you should run the engine at least 40 mph and at least 2500 rpm.
In every water softener system, the regeneration process begins with the backwash cycle. This step reverses the normal flow of water through the resin tank, pushing water upward rather than downward.
The Manual REGEN process takes up to 60 minutes for completion. The process of Manual REGEN may vary for different machines.
Passive Regeneration
If you have mostly driven your diesel car around town and notice that the DPF is becoming blocked, take the car out on a long, motorway journey in an attempt to burn off the soot. On the motorway or dual carriageway, use a gear down (5-speed use 4th and 6-speed use 5th) to increase the engine revs.
A diagnostic tool is required to start the regeneration process, and the engine is run at a high idle to raise the exhaust temperature and burn off the soot.
Faulty MAF sensor - If the Mass Airflow (MAF) sensor is not working correctly (or at all), the DPF regeneration process may not be triggered when necessary, resulting in a blocked DPF. This can also prevent the engine and the electronic control unit (ECU) from working correctly.