Why Doesn't vehicles have this?

[RagmopInKona]

The vehicles can show you the tire psi at all 4 corners, but not the spare.
Ya ya, I know many vehicles today don't come with one or it is an extra cost option.
But it be nice if for those with one or add one could have it listed on the menu with the other 4.

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[Joshinator99]

The vehicles can show you the tire psi at all 4 corners, but not the spare.
Ya ya, I know many vehicles today don't come with one or it is an extra cost option.
But it be nice if for those with one or add one could have it listed on the menu with the other 4.

This is a really good idea. Most people completely ignore the spare and when they really need it, it’s flat lol.

 

[sirben711]

Personally I would really like to know tire temp too!

 

[Mach VII]

To conserve the life of the battery in a TPMS sensor they typically don't transmit data until tire reaches a certain rotational speed therefore the technology wouldn't work on your spare until you cue it up via tire rotation...

 

[RagmopInKona]

To conserve the life of the battery in a TPMS sensor they typically don't transmit data until tire reaches a certain rotational speed therefore the technology wouldn't work on your spare until you cue it up via tire rotation...

I don't know about that.
When I had to use my full sized spare on my Winter car/suv and had the flat fixed and it was in the back of the vehicle for a month because of the weather, and it showed the psi of that tire on the dash, and it was laying flat behind the 2nd row seats for at least a month.

 

[Mach VII]

I don't know about that.
When I had to use my full sized spare on my Winter car/suv and had the flat fixed and it was in the back of the vehicle for a month because of the weather, and it showed the psi of that tire on the dash, and it was laying flat behind the 2nd row seats for at least a month.

https://en.wikipedia.org/wiki/Tire-pressure_monitoring_system

"... To save energy and prolong battery life, many dTPMS sensors do not transmit information when parked (which eliminates spare tire monitoring) or apply a more power expensive two-way communication which enables wake-up of the sensor. "

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