Searched but couldn't find this answer. 07 with 68K in Texas heat. Started getting periodic "TPC Inactve" messages, then it would boot up. Tried reset, no joy. Have changed battery (main OEM under hood) this summer and had no issues with TPC. Now get it working and later inactive at random times, but most lately get all four tires with no reading.
Question is: I know the sensor batteries are suspect, but how does one tell whether it is the reciever ($$$) vs. the sensors ($) ?