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Hi guys, the tire pressure sensors are showing on the display that all tires have 45 psi. I went to the gas station to "experiment" and check this and the tire pressure gage was showing 40 psi an all tires.
Why such a difference? Is the gas station air pressure gage not accurate at all or is it that the sensors/computer in my Sedona are the ones all out of wack? Is this normal or am I doing something wrong
and should I take the vehicle to the dealer since I just bought it?

Thanks
 

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'16 Sedona SX, '09 Genesis
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150 Posts
Are you referencing the tire pressure gauge on the gas station air chuck? Or are you using your own pressure gauge?

I wouldn't trust the gas station's pressure gauge. In fact, I try not to pump up the tires at the gas station unless it's an emergency. I've seen water streams shooting out of those things. I have my own air compressor at home and I use an inline air dryer, but just about anything else is better than getting air at the gas station.

Get a good pressure gauge. I've got a Motion Pro (see below pic) I use around the garage. I also calibrate the pencil gauges I keep in each of my cars and motorcycles against the Motion Pro. I just write down any offset and keep that data with the pencil gauge, so I know what the actual psi is vs. the reading.

 

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'15 Kia Sedona SX
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89 Posts
Here are Kia's recommendations for (potential) malfunctions (yes, for low-pressure warning, but worth a try):

Resetting Your Tire Pressure Light
After you properly inflate your tires, the tire pressure light should go off on its own. If it remains on, there are a few actions you can take:
  • Drive at or above 50 mph for 10 minutes. This can cause your sensor to reset the next time you turn on the car.
  • With the vehicle off, turn the key to the “On” position, but don’t start the car. Hold the TPMS reset button until the tire pressure light blinks three times, then release it. Start the car and wait 20 minutes for the sensor to refresh. The tire pressure monitor reset button is usually located beneath the steering wheel. If you can’t find it, check the user’s manual.
  • Inflate all tires to 3 PSI over their recommended amount, then deflate them completely [ed. note: ?!?]. Be sure to include the spare tire, as it may have a sensor as well. Once they’re all deflated, re-inflate to the recommended tire pressure.
  • With the vehicle off, disconnect the positive battery cable with a wrench. Turn the car on and honk the horn for about three seconds. This will discharge any power still stored in the vehicle. Then reconnect the battery.
 
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