P20E5
Exhaust Gas Temperature Sensor 1/2 Correlation (Bank 2)
EGT sensors 1 and 3 on bank 2 disagree by more than the allowed tolerance — one is reading off, or there is a real temperature gradient that exceeds the calibrated map (e.g. from a leaking exhaust joint between the two locations).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- One EGT sensor driftsCommon
Parts involved
- Exhaust Gas Temperature Sensor
P20E5 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.