OBD-II code · Powertrain (generic, extended)
P226D Particulate Filter Deteriorated/Missing Substrate (Bank 1)
The DPF substrate on bank 1 has been detected as cracked, melted, or removed. Differential pressure across the filter is too low for the measured exhaust flow — the soot trap no longer works.
Is it safe to drive with P226D?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySubstrate cracked or melted from runaway regen
- PossibleSubstrate removed by tampering
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Likely to fail
- Parts involved
- Diesel Particulate Filter, Dpf Differential Pressure Sensor
Related codes
- P226EParticulate Filter Deteriorated/Missing Substrate (Bank 2)
- P226AWater in Fuel Lamp Control Circuit
- P226BTurbocharger/Supercharger A Boost Pressure Too High - Mechanical
- P226CTurbocharger Boost Control A Slow Response
- P226FTurbocharger Boost Control B Slow Response
- P2270O2 Sensor Signal Stuck Lean (Bank 1, Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.