Mercury Grand Marquis persistent trunk ajar signal beeping despite sensor and latch replacement on Mercury Grand Marquis

Some Mercury Grand Marquis owners report experiencing a persistent trunk ajar signal even after replacing the sensor and latch. These issues may stem from wiring problems leading to the latch/position sensor, which can cause the signal to malfunction. Some users have found temporary relief by disabling the trunk ajar signal through methods such as tricking the sensor with a rope to register the trunk as closed. Additionally, consulting the owner's manual may provide valuable troubleshooting insights for this issue. If the problem continues, many owners recommend seeking a professional mechanic or dealership for a thorough diagnosis and resolution.