I had my tire pressure monitor throw an alarm one day right after parking in a truck stop. Both tires on driver's side were indicating a leak. My TPM will throw an alarm if it senses pressure reduction rate too high as well as the absolute pressure too low and it was telling me that both tires were leaking (but still over 100 lbs). Turns out I parked (one side) in a big puddle.
By the time we finished lunch everything was back to normal and off we went. It's surprising how much pressure can change from little things. I can easily get 10 lbs difference driving down the road because of the sun.
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