Powertrain
generic / SAE
P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
The differential pressure sensor or temperature monitor across the diesel particulate filter (DPF) reports that filtration efficiency has dropped below the legal threshold. Common after a damaged filter substrate, blocked passages from failed regenerations, or a leak around the housing.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 02
Possible causes
- DPF heavily loaded — repeated short trips prevent regeneration high
- Filter substrate cracked or melted from runaway regeneration medium
- Differential pressure sensor drift medium
- Leak around DPF housing low
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–4000 €
- Estimated time: 2–8 h
- Component: diesel particulate filter
- Component: dpf differential pressure sensor
- Component: dpf temperature sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012