P2002: Diesel Particulate Filter Efficiency Below Threshold B1
Severity: medium
What it means: The diesel particulate filter (DPF) isn't trapping soot as efficiently as expected.
Safe to drive? Usually drivable, but get it checked. Emissions and regeneration are affected.
Common symptoms
- Check-engine light
- Possible soot at the tailpipe
Likely causes, ranked
- Cracked or damaged DPFShop
- Faulty differential pressure sensor or hosesShop
- Other sensor or software faultShop
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What it means: The diesel particulate filter (DPF) isn't trapping soot as efficiently as expected.
Severity: Medium. Safe to drive? Usually drivable, but get it checked. Emissions and regeneration are affected.
DIY or shop?
Shop. Diesel aftertreatment needs proper diagnosis.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.
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