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DTC codes / P01xx · Fuel and air metering / P014C

P014CO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1

P014C indicates that the upstream oxygen sensor on bank 1 is responding too slowly when the engine transitions from a rich to a lean condition. The powertrain control module monitors the sensor's voltage switching time and sets this code when the response exceeds the calibrated threshold.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage