Low tire pressure problem?

Okay so I took my car last week to get the tires filled with air since my low tire pressure light came on, and the guy said that the drivers side tire was lower than all the others which meant it needed to be replaced? Everything was fine until now, I just got the light turned on again. Could it be that the tire... show more Okay so I took my car last week to get the tires filled with air since my low tire pressure light came on, and the guy said that the drivers side tire was lower than all the others which meant it needed to be replaced? Everything was fine until now, I just got the light turned on again. Could it be that the tire needs to be patched?
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