P2002
HighP2002 — Low Diesel Particulate Filter (DPF) Efficiency
Description
What the Code Means
Code P2002 indicates that diesel particulate filter (DPF) efficiency is below the threshold. The filter isn't trapping soot properly. Causes can be a clogged DPF, a faulty differential pressure sensor, or an incomplete regeneration. The engine control unit (DME) monitors exhaust backpressure to assess filter condition.
Symptoms
Symptoms
- Indicators: Check Engine Light, DPF regeneration indicator
- Engine: Reduced power, increased fuel consumption
Causes and fixes
Diagnosis and Repair
Step 1: Forced Regeneration
Run a forced DPF regeneration with ISTA diagnostic equipment.
Step 2: Check the Differential Pressure Sensor
Check the DPF differential pressure sensor and its circuit.
Step 3: Replace the DPF
If the filter is clogged and can't be cleaned, replace the DPF (genuine part number 18308567144).
Step 4: Check for Oil Leaks
Check the engine for oil leaks — oil ash clogs the DPF.
Possible secondary damage
Secondary Damage
Ignoring the fault can lead to:
- Excessive exhaust backpressure, which damages the turbocharger
- Engine overheating
- DPF cracking, which requires replacement