Please clarify your troubleshooting...
Did you swap out the "bad" sensor with another one and get the same reading problems? If that is the case, there are only 2 common points, the Tire Minder or the tire stem.
You didn't mention the location of the bad sensor so here is what I would do...
1. Make sure you keep sensors well separated when programing. I have found that if you have them in a pile you can sometimes get a cross programming if you are close to the pile as you program one.
2. Pick any sensor and program it to the front left wheel and test. Then, without reprogramming the position on the TM, test it on all wheels.
- If no problem after testing on all stems then put it in the "good pile" and move to the next sensor.
- If it is bad on more than one stem it is a VERY HIGH probability it is that sensor. Put it in the "bad pile".
- If the sensor is only bad on one stem, it starts to point at that stem. Mark that stem and put the sensor in the "?" pile until you confirm with other sensors the problem repeats on that stem.
Obviously, if all/most sensors are bad on the same stem, something is going on with the stem. Before going beyond 2 sensors testing bad on the same stem I would check the stem for any burrs and clean it up if needed. I would also preemptively replace the core. I've seen the core get bent a little bit and affect sensor operations. I always keep a set of cores and core removal tool on hand when working with tire pressure and sensor changes. Over the course of a few years I've replaced a few cores. Make sure you get high pressure cores.
3. Repeat with all sensors programmed for the front left wheel.
Conversely, if an individual sensor is bad in more than one position, then it needs replacement. I keep 2 extra sensors ready for various reasons but the most likely purpose is to replace one with a dead battery and I don't want to take that time to replace the battery. I've learned to reprogram sensors quickly.
You could even find that the process of reprogramming all sensors during the test "kicks" something and you don't find a problem at all. That will drive you crazy. LOL
There is a VERY REMOTE chance that you monitor is acting funny but if you follow my testing process to the end, you should be able to rule that out entirely. However, if after testing nothing makes sense then it is a possibility.
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