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Hey Folks,

The wife's car is a 2005 LL Bean Outback. (car is over 7 years old and 140K plus on it.)

I have tried to research the TPMS system but have seen conflicting information. Does the TPMS system report pressures that are too high and turn on the light?

What is the general recommendation for when the batteries run out in the Sensors in the wheels? Replace or deactivate the system? What is the Best way to deactivate the system?

Thanks.
 

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The car can only report a fault condition, without knowing what type of fault is occurring.

The wheel sensors can be made in such a way as to trigger a fault on either high or low pressure, however AFAIK the stock Subaru sensors are only sensitive to low pressure.
 

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What is happening?

If the light is flashing that indicated a loss of communications, not a tire pressure issue!
 

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Here's the 2006 FSM explanation of the TPMS. It's probably the same for all 3rd Generation. Let's see if this answers the OP's questions, and clarifies what is, and what isn't, for others.
 

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