Powertrain
generic / SAE
P00B2
Radiator Coolant Temperature Sensor Circuit Range/Performance
Radiator coolant sensor reading implausible compared to engine coolant or expected behavior. The engine coolant temperature sensor feeds warm-up enrichment, fan control and closed-loop entry — a stuck-cold reading keeps the engine in open loop and rich forever.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / B2
Possible causes
- Thermostat stuck open high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–3 h
- Component: radiator coolant temp sensor
- Component: thermostat
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012