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post #1 of 5 (permalink) Old 09-04-2018, 10:57 AM Thread Starter
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TPM Light

Low pressure light started coming on. Any ideas on how to tell which one it is? Pressure is fine in all 4. Just started 2 days ago.

2011 350
130K miles.

12 F350 Lariat. Stock. So far
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post #2 of 5 (permalink) Old 09-04-2018, 11:24 AM
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Check the owner's manual for the re-learn procedure. When you get to a wheel that doesn't re-learn, its battery is probably dead. Rotate the tires to get that one into the last learning position, and try again. If it fails at the same location, it's a system problem. If it fails at the same wheel, buy a new sensor, and have a tire shop install it, and re-learn the system.


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post #3 of 5 (permalink) Old 09-04-2018, 12:03 PM Thread Starter
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If it is a battery, is it replaceable? Or a new TPM?

12 F350 Lariat. Stock. So far
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post #4 of 5 (permalink) Old 09-04-2018, 12:33 PM
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If there is a fault with a sensor and the signal is missing the BCM will set a code for it that will identify the offending sensor. Of course this is dependent on the tires and TPMS sensors were trained with them in the current position. I frequently see this issue when cold werather first creeps in after someone has rotated their tires and set the pressures and not retrain the TPMS sensors.

A quick way to determine if you have a bad sensor is to enter the training mode and any sensor that fails to set... well you know.


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post #5 of 5 (permalink) Old 09-06-2018, 12:20 PM
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Quote:
Originally Posted by mrmedic View Post
If it is a battery, is it replaceable? Or a new TPM?
Yes, one of those. You won't know if the battery is replaceable until you attempt to buy that sensor, or battery for that specific model of sensor.

But generally: OE TPMS sensor batteries are NOT replaceable.


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