P2416 means the ECM/PCM has detected that the oxygen sensor signals from Bank 1 Sensor 2 and Bank 1 Sensor 3 are swapped. The control module expects each sensor to report a specific voltage range; when the signals appear interchanged it sets this code.
The harness plugs for Bank 1 Sensor 2 and Sensor 3 may be inadvertently interchanged, or the wires within a harness may be crossed, causing the ECM to see swapped signals.
Chafed, corroded, or broken wires in the sensor harness can produce erratic voltage readings that the ECM interprets as a signal swap.
A failing sensor may output a voltage outside its expected range, leading the ECM to misinterpret which sensor is which and set the swapped‑signal code.
An upstream exhaust leak can cause false oxygen readings, which may confuse the ECM’s sensor‑signal comparison and trigger the code.
A corrupted or outdated calibration can misinterpret normal sensor voltages as swapped; this is uncommon but possible after other causes are ruled out.
Rarely, a malfunction inside the controller’s signal‑processing circuitry could incorrectly handle sensor inputs; considered only after wiring, sensors, and software are verified.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
No. The PCM is rarely the cause of this code. Most cases are due to crossed wiring, faulty connectors, or sensor issues. Only after those are inspected and found good should a PCM update or replacement be considered.
Yes. If the code moves with the sensors after swapping them, the problem lies with a sensor or its wiring. If the code stays on the same bank, the issue is likely in the harness or ECM.
An exhaust leak near the sensors can produce abnormal oxygen readings that the ECM may interpret as a signal swap, so it should be checked during diagnosis.