P241AO2 Sensor Signals Swapped (Bank 1 Sensor 1 / Bank 1 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
- With P241A the engine controller has concluded that the oxygen readings of the sensor ahead of the bank 1 catalyst and of the sensor behind it fit the opposite mounting positions, so the two plugs or harness legs are most likely crossed. FCA uses the code on the 2011 Ram 2500/3500 with the 6.7L Cummins diesel and calls it an oxygen concentration mismatch between sensors 1/1 and 1/2; bulletin 18-012-12 Rev. A brings revised ECM software for it among other faults. CARB requires every sensor used for fuel control and catalyst checks to be monitored. P241B is the bank 2 pair, P2416 the pair behind the catalyst. In practice the code follows a sensor or exhaust repair; mixture control and catalyst diagnosis then work with wrong data.
- What you may notice
- Check engine light after work on the exhaust or the oxygen sensors
- Mixture adaptation drifts, fuel trims look implausible
- Catalyst or sensor codes set as follow-up faults
- Likely causes
- LikelyUpstream and downstream sensor plugs connected the wrong way round after a repair
- PossibleSensor harness rerouted or wrong replacement harness fitted
- RareDetection software needing an update (FCA 6.7L Cummins)
- 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.