2012 VW Amarok with p2002 DPF Efficiency code

We run you through the testing that got us to the bottom of the often-open ended code P2002 Particulate Trap Efficiency.
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[@deanobrien9375]

Mate awesome diagnosis, and well explained.

[@mickhofman]

great work TAT

[@JamesParus]

That is good info that is uses maf value for the calculation. I got this error with new maf that seems faulty.

[@callumge]

How much would replacing the dpf roughly cost? Australia