DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P00B1
P00B1 indicates that the powertrain control module has detected an abnormal signal from the radiator coolant temperature sensor circuit, which monitors the temperature of the coolant leaving the radiator. The computer compares this reading with other temperature sensors and sets the code when the signal is out of range, intermittent, or implausible.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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