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Discussion Starter · #1 ·
I havent had a new car for a while and I like to check my tire pressures, I realize the sensors monitor the tires but the valve caps have green things on them, does that mean pressire is good, do they change to say red if theres a problem??
 

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It just means that the tires are inflated with nitrogen which is very stable due to changes in temperature.
 
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