Powertrain
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Lights the check engine lamp
P28FA: Exhaust Pressure Too Low Bank 2
Standardized SAE J2012 code · P28xx codes
What does P28FA mean?
The exhaust pressure measured on bank 2 falls below the calibrated minimum. Common causes are leaks upstream of the sensor, missing DPF substrate, or sensor calibration drift.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Exhaust leak upstream of sensor
- Medium Sensor zero point drifted
Likelihood is a general estimate across vehicles; your make and model may differ.
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P28FA in the community
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