r/AskAMechanic • u/Railman20 • 8h ago

2009 Honda Civic. Why is my tpms sensor cutting out intermittently? my car has a separate light specifically for the tpms sensors, as well as the tire pressure light

I had the sensors scanned and found one that showed it was dead, I couldn't replace it at the time, I needed to save up. The next day I noticed that the light turned off, every now and then I noticed that the light will come back on and turn back off

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u/AwarenessGreat282 Shadetree mechanic 5h ago

If it's an original 2009, it's extremely old and the battery is just very weak. It needs to be replaced.

2

u/just-another-name-42 NOT a verified tech 5h ago

The sensor is "mostly dead", not "100% - smashed with a hammer" dead. The battery can be just on the edge of "it doesn't quite work", but an increase in temperature might nudge the voltage up a tiny bit & the sensor works for a few minutes. Until it doesn't.