Exhaust / DPF · Severity: Moderate
P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
The ECU detects that the DPF is not trapping soot as expected.
Common symptoms
- Engine light
- Black smoke
- Failed emissions test
Likely causes
- Cracked or removed DPF substrate
- Faulty differential pressure sensor
- Split sensor hoses
First test to run
Check differential pressure reading at idle and at 3,000 rpm; a near-zero reading under load points to a damaged DPF or hose.
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