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since there's really no way to figure out which sensor failed)
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Not true...
We have a reader which you hold near the valve stem on each wheel, and it will tell you the battery state of the sensor, along with other info.... i.e. sensor ID, tire pressure..
So you can identify which sensor has, or is failing... TPMS sensors seem to last 5-7 years... they just have a tiny Lipo battery in them.....
I think the reader we have can tell the s/n or unique id of the sensor....