What does code P241B mean?

Q: What does code P241B mean?

O2 Sensor Signals Swapped Bank 2 Sensor 1 and Sensor 2. This code means the engine computer has detected that the upstream and downstream oxygen sensor signals on bank 2 are swapped or inverted relative to what it expects. The computer is seeing the rear sensor's voltage behave like a front sensor and the front sensor behave like a rear sensor, which tells it the two signal circuits are likely crossed or misrouted.

DTC codes / P24xx · Auxiliary emission controls / P241B

P241BO2 Sensor Signals Swapped Bank 2 Sensor 1 and Sensor 2

This code means the engine computer has detected that the upstream and downstream oxygen sensor signals on bank 2 are swapped or inverted relative to what it expects. The computer is seeing the rear sensor's voltage behave like a front sensor and the front sensor behave like a rear sensor, which tells it the two signal circuits are likely crossed or misrouted.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.