When the regeneration process of DPF (diesel particulate filter) continues for 40 minutes but still fails, there may be multiple reasons and corresponding solutions involved.

[ Cause Analysis ]

Particle trap blockage: The main function of DPF is to capture particulate matter in diesel vehicle exhaust. When these particulate matter accumulate excessively, it may cause DPF blockage, thereby affecting the regeneration process.

Insufficient temperature: DPF regeneration requires a high-temperature environment. If the engine temperature is not sufficient, the regeneration process may not proceed smoothly.

Poor fuel quality: Using inferior fuel may cause premature blockage of the DPF, thereby affecting the regeneration effect.

Poor driving habits: Frequent short distance driving may prevent the engine from reaching a sufficiently high temperature, thereby affecting DPF regeneration.

DPF component failure: Ceramic detachment or other component failures inside the DPF may also cause regeneration failure.

[ Solution ]

Check and clean the DPF: Use professional cleaning equipment to thoroughly clean the DPF to restore its normal operation. If cleaning is ineffective, it may be necessary to consider replacing the DPF components with new ones.

Raising engine temperature: By appropriately increasing the vehicle speed or extending the driving time, the engine can reach a higher temperature, which helps with DPF regeneration.

Improving driving habits: Avoid frequent short distance driving and ensure that the engine has enough time to reach high temperatures to promote DPF regeneration.

Use high-quality fuel: Choose high-quality fuel and avoid using inferior fuel to reduce the risk of DPF blockage.

Check and reset ECU: If the internal ceramic body falls off or other components malfunction after disassembling the DPF, it is necessary to replace and reset the ECU in a timely manner before attempting regeneration.

Seeking professional repair: If none of the above methods can solve the problem, it is recommended to seek professional automotive repair services to ensure that the problem is properly resolved.

[ Precautions ]

When performing DPF regeneration, please ensure that the vehicle is in a safe environment and away from flammable and explosive materials.

If the malfunction indicator light comes on during the regeneration process, please follow the vehicle manual or the advice of professional maintenance personnel for operation.

Regularly inspect and maintain the DPF to ensure its proper functioning and extend its service life.

In summary, when DPF regeneration still fails after 40 minutes, analysis can be conducted from the aspects of particle trap blockage, insufficient temperature, fuel quality, driving habits, DPF component failure, etc., and corresponding solutions can be taken. If the problem cannot be solved, it is recommended to seek professional car repair services.