Blog

During regeneration the engine burns off the soot accumulated in the particulate filter: it generally takes 10-20 minutes and must not be interrupted by switching off the engine. Repeated interruptions are the number one cause of clogged DPFs.

How to recognise it

• Higher idle than usual and fan running constantly
• Acrid smell and light smoke from the exhaust
• Higher instantaneous consumption, start&stop disabled
• On some cars the DPF light or a dedicated message appears

What to do

• If you can, keep driving for 15-20 minutes at a steady speed, ideally above 2,000 rpm
• Avoid switching off the engine before the cycle has finished
• Respect the oil change intervals: the oil is diluted by diesel during regenerations

What not to do

• Do not repeatedly switch off during the cycle: soot builds up and the filter clogs
• Do not ignore a steady DPF light: from then on a regeneration with a diagnostic tool is needed
• Do not use “miracle” additives instead of maintenance

How MasterTuning helps

We measure the real load of the filter, carry out a forced regeneration with the diagnostic tool and fix the upstream causes (EGR, injection, sensors) to stop it happening again. If the filter is too loaded, we proceed with professional cleaning instead of replacement. Centres throughout Italy.

Read more: what is ECU remapping · vehicle database · find an installer

Does your DPF clog often? Book a diagnosis at your nearest MasterTuning centre.

Frequently asked questions

How long does DPF regeneration take?

Generally 10-20 minutes of driving. If it is interrupted, the car will try to repeat it on the next cycle.

What happens if I switch off the engine during regeneration?

The cycle is interrupted and the soot stays in the filter: doing this often clogs the DPF until power is lost.

Can I do the regeneration while stationary?

A static regeneration must be done in the workshop with the diagnostic tool, monitoring temperatures and filter load.