Particulate Filter Check

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This particle number test for the periodic technical inspection    (PTI-PN test) was developed for diesel vehicles fitted with a diesel particulate filter (DPF). The test has now been introduced in Belgium, the Netherlands, Switzerland and Germany.


This website contains information about the PTI-PN test (or particulate filter check).

Particles Matter (126 pages) explains all you

need to know about  the PTI-PN test

and particulate filter technology in general.

Click here to find out more.