Peugeot 406 Tailgate Hall Sensor Fault

Electrical sensor issues can be tricky. Did you check the sensor wiring for damage or corrosion? Maybe try cleaning the contacts before digging deeper.

Beyond visual inspection and contact cleaning, is there a method to effectively test the hall sensor's functionality prior to replacement, or is relying solely on error codes sufficient?

While you could try testing the sensor itself with a multimeter, interpreting the readings can be difficult without the proper specs. Considering the symptoms and potential wiring issues, it might be worth having a workshop take a look, especially if you're not comfortable tracing electrical faults.

The issue was indeed a defective sensor cable. Repair, including parts and labor, amounted to 95€. The tailgate now functions as expected.