P0548
Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1
Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1: the signal voltage is below the expected range. 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.
- Signal shorted to groundCommon
- Connector pins corroded - high contact resistanceLess likely
- Harness chafing through insulationLess likely
Parts involved
- Egt Sensor B2s1
P0548 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.