P241BO2 Sensor Signals Swapped (Bank 2 Sensor 1 / Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P241B concerns only engines with a second exhaust bank, typically V engines: the controller has decided that the front and rear oxygen sensors of bank 2 deliver signals that belong to each other's position. No manufacturer bulletin names P241B publicly; the only published use of this check found is FCA's bank 1 version P241A on the inline-six Cummins, where it is described as an oxygen concentration mismatch. A frequent variant on V engines is not a swap within bank 2 at all, but a sensor plugged into the bank 1 harness, which is why P241A and P0041 deserve a look as well. CARB sets the monitoring duty for oxygen sensors. Until the wiring is right, fuel control and catalyst testing of bank 2 cannot be trusted.
- What you may notice
- Check engine light shortly after work on bank 2
- Bank 2 fuel trims or catalyst monitor results implausible
- Likely causes
- LikelyBank 2 sensor plugs swapped during a sensor or exhaust repair
- PossibleBank 2 sensor plugged into the bank 1 harness side
- RareSensor with the wrong type or cable length fitted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €150
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.