P2002high severityPowertrain
Diesel Particulate Filter Efficiency Below Threshold Bank 1
on 2009 Audi A3 2.0L TDI · FWD
What this code means
The DPF on bank 1 is not filtering soot effectively. Differential pressure across the filter is abnormal.
Symptoms
- Check engine light
- DPF warning light
- Reduced power
- Excessive black smoke
Common causes
- Clogged/damaged DPF
- Failed differential pressure sensor
- Faulty DPF temperature sensor
- Oil contamination of DPF
Diagnostic steps
- Check DPF differential pressure
- Inspect temperature sensors
- Attempt forced regeneration
- Check soot loading percentage
Repair notes
Attempt forced regeneration first. If soot load exceeds limit, professional cleaning or DPF replacement required.
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