Question
How does altitude affect TPMS readings?
Answer
High altitude reduces atmospheric pressure, making TPMS readings seem low (1 PSI per 1,000 feet).
Explain
At 5,000 feet, atmospheric pressure drops ~5 PSI, so a tire at 32 PSI (sea level) reads 27 PSI. CHEPQ tools don’t correct for altitude—technicians should adjust inflation to OEM specs at the vehicle’s operating altitude.
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