What does code P25F7 mean?

Q: What does code P25F7 mean?

AIR System B Incorrect Flow Detected. P25F7 indicates that the powertrain control module has detected an incorrect flow rate in the secondary air injection system for bank B, which is the side of the engine that does not contain cylinder number one. The computer monitors the system during the cold-start phase and compares the expected airflow, derived from oxygen sensor response, against the actual flow it observes.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25F7

P25F7AIR System B Incorrect Flow Detected

P25F7 indicates that the powertrain control module has detected an incorrect flow rate in the secondary air injection system for bank B, which is the side of the engine that does not contain cylinder number one. The computer monitors the system during the cold-start phase and compares the expected airflow, derived from oxygen sensor response, against the actual flow it observes.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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