P2084
Exhaust Gas Temperature Sensor Range/Performance (Bank 1 Sensor 2)
The bank 1 sensor 2 EGT reading deviates from the expected ratio against the upstream EGT sensor or modeled exhaust temperature. Confuses DPF regeneration control and may force a forced regen.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor aged or driftingCommon
- DPF heavily loaded — non-physical temperature gradientPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Egt Sensor
P2084 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.