P20E4
Exhaust Gas Temperature Sensor 2/3 Correlation (Bank 1)
Exhaust Gas Temperature Sensor 2/3 Correlation (Bank 1): the value does not correlate with the related sensor or expected pattern. The ECU uses this temperature to protect the catalyst and diesel particulate filter.
- 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
P20E4 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.