To disable the tire pressure sensor on a Peugeot 407 SW, you typically need to access the vehicle's settings through the onboard computer. Navigate to the tire pressure monitoring system (TPMS) settings and look for an option to deactivate or reset the sensors. Alternatively, you can disconnect the battery for a short period, which may reset the system, but this is not a recommended long-term solution. Always consult the vehicle's manual or a professional mechanic for guidance tailored to your specific model.