What does code P01F1 mean?

Q: What does code P01F1 mean?

O2 Sensor Circuit Bank 1 Sensor 4. P01F1 indicates that the powertrain control module has detected a fault in the heater circuit or signal circuit for the downstream oxygen sensor on bank 1, specifically sensor 4. The computer monitors the sensor's electrical behavior and sets this code when the circuit falls outside expected parameters, which can affect fuel trim and emissions control.

DTC codes / P01xx · Fuel and air metering / P01F1

P01F1O2 Sensor Circuit Bank 1 Sensor 4

P01F1 indicates that the powertrain control module has detected a fault in the heater circuit or signal circuit for the downstream oxygen sensor on bank 1, specifically sensor 4. The computer monitors the sensor's electrical behavior and sets this code when the circuit falls outside expected parameters, which can affect fuel trim and emissions control.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.