It’s around 40°F outside, so maybe the cold is messing with it? Both sides show the same pressure, but the left one still triggers the warning. Any advice?
Did you just add air? Usually driving for a bit clears the warning.
Noble said:
Did you just add air? Usually driving for a bit clears the warning.
I added air yesterday morning since they were at 20 PSI. I drove for a while after that, but the warning hasn’t cleared yet 
@Vic
You might need to get them above 35 PSI to clear the warning. If the left one dropped low enough to trigger the sensor, airing it up to just below the threshold won’t turn it off.
@Vic
20 PSI is pretty low. Are you sure you don’t have a leak? Hitting any potholes recently?
Diya said:
@Vic
20 PSI is pretty low. Are you sure you don’t have a leak? Hitting any potholes recently?
Nope, I’m super careful. It went from 80°F to 25°F overnight, so I think the cold messed with the pressure.
Top off all four tires to what the door sticker says (usually 35-36 PSI) and drive around for a bit. If the warning doesn’t clear, you might have a faulty sensor.
Luca said:
Top off all four tires to what the door sticker says (usually 35-36 PSI) and drive around for a bit. If the warning doesn’t clear, you might have a faulty sensor.
I did that yesterday. All tires were at 36, but the warning still stayed on. Could it just be the cold?
@Vic
Cold temps can cause the pressure to fluctuate, but if they’re all at 36 now, the warning should eventually clear.
Sometimes the air pumps at Costco read a bit higher than your car’s sensors. I usually set the pump to 41 PSI to get it to 38 in the tires. After driving a bit, the warning goes away.
Uma said:
Sometimes the air pumps at Costco read a bit higher than your car’s sensors. I usually set the pump to 41 PSI to get it to 38 in the tires. After driving a bit, the warning goes away.
That makes sense! I set it to 35 but maybe it didn’t fill enough because of the cold. Thanks! And funny enough, I did go to Costco, lol.
Inflate all four tires to 2 PSI above the recommended pressure on the door sticker, then drive a mile or two above 30 MPH. If it still doesn’t clear, you might have a sensor issue.
Whit said:
Inflate all four tires to 2 PSI above the recommended pressure on the door sticker, then drive a mile or two above 30 MPH. If it still doesn’t clear, you might have a sensor issue.
I tried this, and it worked! The cold snap really messed with the pressure, though. Thanks for the tip!
Update:
I overfilled the tires slightly, and the warning finally cleared! The sudden drop in temperature—from 80°F to 25°F overnight—caused all four tires to drop to 20 PSI. I initially filled them to 35, but Costco’s pump only got them to 34. After bumping them to 38 at Costco (which actually made them 36), everything is fine now. Thanks for the help!
@Vic
I’ve had the same issue when driving in colder areas. I had to inflate mine to 37 PSI before the warning finally cleared.
Check your spare tire too. Some cars have a sensor on the spare, and if it’s low, it could trigger the TPMS warning.