Petrol particle filter

Petrol cars are fitted with particle filters for more efficient emission control.

Particles in the exhaust gases are collected in the petrol particle filter during normal driving. In normal driving conditions, passive regeneration takes place, which leads to the particles being oxidised and burned away. The filter is emptied in this way.

If the car is driven at low speed or with repeated cold starts in low outside temperature, active regeneration may be necessary. Regeneration of the particulate filter is automatic and normally takes 10-20 minutes. There may be a smell of burning during regeneration.

Use the parking heater in cold weather - the engine then reaches normal operating temperature more quickly.

When driving short distances at low speeds in a petrol car

The capacity of the emissions system is affected by how the car is driven. It is important to drive varying distances at different speeds to achieve optimal performance.

Driving short distances at low speeds (or in cold climates) frequently, where the engine does not reach normal operating temperature, can lead to problems that can eventually cause a malfunction and trigger a warning message. If the vehicle is mostly driven in city traffic, it is important to regularly drive at higher speeds to allow the emissions system to regenerate.

  • The car should be driven on A-roads at speeds in excess of 60 km/h (38 mph) for at least 20 minutes between each refuelling.

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