Question about 2005 Mercury Mountaineer

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Tire pressure sensor fault goes on while driving

Mostly when on the highway for awhile, Tire pressure sensor fault goes on and sometimes even disables my AWD. Had it checked and its never on when i bring it in, so they dont know what to tell me

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  • Chuck Martin
    Chuck Martin May 11, 2010

    Who is checking it.Are they checking to see if any trouble codes are stored in the memory of the tire pressure monitoring system and are they checking for any continuous memory codes to see if maybe the network is going off line?



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Tire pressure always changes...
when you drive your vehicle for a long period of time the tires' temperature goes up along with the
pressure in your tires, the molecules in the air inside your tires get excited (hot)
when your vehicle is immobile for a while your tires' temperature goes down along with the
pressure in your tires, the molecules in the air inside your tires get compacted (cold)
This is the best time to get a true PSI reading from your tires....
the recommended tire pressure on most tires should be set at 35PSI
But there might be a problem with your sensors, I work with TOYOTA their sensors are set up to
where when the PSI on your tires drops below the 35PSI, the tire pressure light would then
come on.
You should also check if your spare tire comes equipped with pressure sensors, which in most cases
they do, depending on the type of tire the PSI on spare tires will usually range from 35PSI- 80PSI
you can check your owners manual for this, or simply read the recommended PSI written on the

Posted on Mar 05, 2009

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Sometime you need to actually bleed off air pressure and reservice to tire specs.

Posted on Mar 05, 2009

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Never look on sidewall of tire for correct psi. Look on driver door placard. This is the recommended pressure from the vehicle manufacturer.

Posted on Mar 22, 2013

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Posted on Jan 02, 2017

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