4Runner TPMS Sensor Issue

Your predicament sounds familiar. I encountered a similar situation with my 2012 Volvo XC60. The symptoms you describe mirror my experience precisely. In my case, the culprit was a failing tire pressure sensor. These sensors are equipped with internal batteries that degrade over time and eventually lose their capacity to transmit data reliably. Even if the sensor is still transmitting a signal, a low battery can result in spurious or inaccurate readings. What make and model of diagnostic tool are you using?

Thank you for the insightful response. I'm currently using a professional-grade diagnostic scan tool from Bosch. It provides detailed information, including live sensor data, but I'm uncertain if it can specifically assess the battery health of each individual TPMS sensor. How did you finally confirm that it was the sensor and not something else?

Bosch diagnostic tools typically don't offer specific battery health assessments for TPMS sensors. In my case, confirmation necessitated a visit to a trusted automotive workshop equipped with specialized TPMS diagnostic equipment. They possess tools capable of interrogating each sensor individually, assessing battery status, signal strength, and overall functionality. Given your symptoms and the age of your sensors, it's highly probable that one or more sensor batteries are nearing the end of their service life. I suggest a visit to such a workshop for definitive diagnosis.

Many thanks again for your advice. I took your suggestion and went to the mechanic. The diagnostic test showed that the battery of the tire pressure sensor was indeed empty. The mechanic replaced it and reconfigured the tire pressure monitoring system. The error is gone, and everything is working correctly again. The repair cost me 280€.