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This morning, when I got into the car, a red tire pressure alarm light came on.
I checked all 4 tires, and their pressure was around 27 PSI, quite low.
Using a pump, I inflated them to 36 PSI.
But the tire pressure alarm light was still on!
Could it be the backup tire?
Yes, the backup tire’s pressure was also 27 PSI.
After inflating it to 36 PSI, the alarm finally turned off.

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