Faulty TPMS sensor? What to trust?

[Bluemustang]

I got new wheels/tires and new TPMS sensors. The driver rear is reading 7 psi lower than the other three. But when I measure all four with Jaco handheld gauge I get a consistent reading. It is also consistent with my portable air compressor. The suspected TPMS sensor is not giving me no reading, just an inconsistent reading. Which should I trust?

I just find it odd that one is still giving me a reading and it does change as the tire warms up and yet it can be so far off.

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[GTP]

Of course you absolutely trust the Jaco gauge.

You could rotate that wheel to another corner and see if the display low reading follows the wheel.

If your car is 2015, it's probably just a low battery in the TPMS sensor.

 

[ZeroTX]

The aftermarket ones that came with my wheel/tire combo seem a little inconsistent. The stock ones were exactly on point to the exact PSI, but these seem to vary 1-3psi and change while driving. Not enough to set off a light.

 

[Skye]

Are the new sensors Ford OEM, or aftermarket? If the latter, odds are good the sensor is at fault. Poor quality, low battery or slack tolerances. I'd replace all four with Ford OEM units.

If Ford, sold as new and appear to be installed correctly, chat up the reseller to discuss warranty and returns.

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