OBD-II code · Powertrain (generic, extended)
P28F8 Exhaust Pressure Too High Bank 2
The exhaust pressure measured on bank 2 exceeds the calibrated maximum. Common causes are clogged DPF, restricted exhaust path, or stuck exhaust brake/back-pressure valve.
Is it safe to drive with P28F8?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyDPF clogged with soot or ash
- PossibleBack-pressure valve stuck closed
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–8 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Exhaust Pressure Sensor B2, Particulate Filter, Exhaust System
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.