P2002 — Diesel particulate filter (DPF) efficiency below threshold (Bank 1)

Likely causes

• Excessive soot from incomplete regeneration cycles
• Faulty DPF differential pressure sensors
• Empty FAP additive or failed additive injector (system-dependent)

Recommended checks

1. 1

   Force a parked regeneration with a capable scan tool

2. 2

   Clean or replace the DPF if it is clogged beyond limits

3. 3

   Check DPF pressure and temperature sensors upstream and downstream

Parts to replace

• Diesel particulate filter (DPF)

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• DPF differential pressure sensor

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• FAP additive fluid

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