What does code P24F5 mean?

Q: What does code P24F5 mean?

NOx Sensor Delayed Response - High to Low Bank 1 Sensor 2. P24F5 means the engine control module has detected that the downstream nitrogen oxide sensor on bank 1 is too slow to switch from a high reading to a low reading during the monitor's test window. The sensor is still producing a signal, but its response time has degraded beyond the calibrated limit, so the module cannot trust it for emissions control.

DTC codes / P24xx · Auxiliary emission controls / P24F5

P24F5NOx Sensor Delayed Response - High to Low Bank 1 Sensor 2

P24F5 means the engine control module has detected that the downstream nitrogen oxide sensor on bank 1 is too slow to switch from a high reading to a low reading during the monitor's test window. The sensor is still producing a signal, but its response time has degraded beyond the calibrated limit, so the module cannot trust it for emissions control.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaAuxiliary emission controls

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