What the light indicates
The particulate filter warning light (or the engine light, depending on the vehicle) signals that the system has detected a level of clogging or a fault. The symbol and exact meaning vary from vehicle to vehicle: check the owner's manual.
What to do right away
- Read the manual: some manufacturers advise driving a stretch at sustained speed to help regeneration, others do not.
- Do not ignore the light and do not keep driving for long in these conditions: the clogging can get worse.
- If you notice a loss of power, reduced-power mode or a strong exhaust smell, have the vehicle checked.
- Describe the lights and symptoms to a professional: a diagnosis shows whether the problem is in the filter or in other components.
The most common causes
- Short trips and mostly urban use
- Repeatedly interrupted regenerations
- Faulty pressure or temperature sensors
- Problems with injectors, the EGR valve or other components
- Damaged filter or filter saturated with ash
What not to do
Do not have the filter removed or deactivated: it is a component of the vehicle's emission control system and its removal is not part of our work.
Our services
General information, updated 26 October 2026. Specific guidance for your vehicle is in its owner's manual and should be checked with a professional.