2005 Dodge Grand Caravan P0032: Heater Control Circuit High Bank 1 Sensor 1 - O2 Sensor Replacement Not Resolving Issue

I recently encountered a check engine light with code P0032 — Heater Control Circuit High Bank 1 Sensor 1 on my 2005 Dodge Grand Caravan with a 3.8L engine. I was advised that the issue was caused by a faulty oxygen (O2) sensor located in front of the catalytic converter. I replaced it, and the check engine light disappeared for about a week. However, the same P0032 code has returned. When I tested the voltage to the sensor while the engine was running, it fluctuated between 9.5 and 10 volts — which is outside the normal range (typically around 0.1–0.9V for upstream O2 sensors). This suggests a problem with the wiring harness or signal path delivering power to the sensor. I’ve inspected the harness visually and don’t see any obvious breaks or damage. What should I do next? Is it possible that the replacement sensor is aftermarket, or could there be an issue with the vehicle’s wiring or ECU communication?