P00B1
Radiator Coolant Temperature Sensor Circuit
Generic electrical fault at the radiator coolant temperature sensor (downstream of radiator, used for thermostat diagnosis).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failedCommon
Parts involved
- Radiator Coolant Temp Sensor
- Sensor Wiring
P00B1 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.