P2002 on BMW Diesel – DPF Efficiency Below Threshold

BMW diesel-specific notes for P2002. Often driven by DPF loading history, sensor plausibility and regen success.

How It Usually Shows Up

  • Engine light with reduced power on some models.
  • DPF-related messages on the dash (varies by model).
  • Often combined with soot accumulation or pressure sensor codes.

Common BMW Diesel Causes

  • DPF overloaded from repeated incomplete regenerations.
  • Pressure sensor drift or blocked sensor pipes.
  • Underlying EGR faults increasing soot production.
  • Boost leaks or underboost leading to smoke and faster DPF loading.

Suggested Test Plan

  1. Read DPF soot load / ash load and regen history with a capable scan tool.
  2. Check differential pressure plausibility vs RPM/load.
  3. Address EGR and boost faults first if present.
  4. Only consider forced regen after the soot-producing root cause is fixed.