TPMS Sensors (lack of)

[Crazy Asylum]

So long story short, I swapped my TPMS sensors into my summer wheels. About a week ago switched back to the stock wheels for the winter without moving the sensors back into them. After doing so I fully expected the warning to be lit up on my dash but its not. I start the car, it lights up for a seconds as it normally would, but then shuts off..

Am i wrong to believe that the lack of sensors would keep the light on? Could there be something wrong with my system where it believes they are present and reading 'all good'? Only relevant modifications I'm running at the moment is an OFT e85 stage 2 in its stock configuration. Thanks!

[8RZ]

Are the wheels with the sensors near your car when you start it up?

[Tcoat]

Originally Posted by Crazy Asylum

So long story short, I swapped my TPMS sensors into my summer wheels. About a week ago switched back to the stock wheels for the winter without moving the sensors back into them. After doing so I fully expected the warning to be lit up on my dash but its not. I start the car, it lights up for a seconds as it normally would, but then shuts off..

Am i wrong to believe that the lack of sensors would keep the light on? Could there be something wrong with my system where it believes they are present and reading 'all good'? Only relevant modifications I'm running at the moment is an OFT e85 stage 2 in its stock configuration. Thanks!

Have you driven the car? It should come on after you drive a few miles. When I switch to my winters with no sensors the light stays out for about 20 miles and then comes on and stays on all winter.
If you have driven and it still isn't one then something is weird.

[Icecreamtruk]

If your wheels with the sensors on are close to where you park your car, it will still receive the signal. You need to drive something like 30 or 50 miles without the sensors on the wheels for it to light up, and as soon as you park next to them they will go away in a minute or so.

By close I mean it could be inside your house a good 50-60 feet away and still receive the signal (as is the case for me).

[wparsons]

Originally Posted by Icecreamtruk

If your wheels with the sensors on are close to where you park your car, it will still receive the signal. You need to drive something like 30 or 50 miles without the sensors on the wheels for it to light up, and as soon as you park next to them they will go away in a minute or so.

By close I mean it could be inside your house a good 50-60 feet away and still receive the signal (as is the case for me).

I find it's about 20km's before the light comes back, but I haven't accurately tested it.

My summers are in the basement, but my car still picks them up from inside the garage. If I park outside it doesn't always get them, but in the garage works every time.

[Crazy Asylum]

Originally Posted by 8RZ

Are the wheels with the sensors near your car when you start it up?

They're in my basement, on the other side of my house.

Originally Posted by Tcoat

Have you driven the car? It should come on after you drive a few miles. When I switch to my winters with no sensors the light stays out for about 20 miles and then comes on and stays on all winter.
If you have driven and it still isn't one then something is weird.

I've probably put around 20 or so miles on it since. I'll put some miles on it tonight after work and report back.

Originally Posted by Icecreamtruk

If your wheels with the sensors on are close to where you park your car, it will still receive the signal. You need to drive something like 30 or 50 miles without the sensors on the wheels for it to light up, and as soon as you park next to them they will go away in a minute or so.

By close I mean it could be inside your house a good 50-60 feet away and still receive the signal (as is the case for me).

Originally Posted by wparsons

I find it's about 20km's before the light comes back, but I haven't accurately tested it.

My summers are in the basement, but my car still picks them up from inside the garage. If I park outside it doesn't always get them, but in the garage works every time.

I didnt realize they had such range... I'll try moving my other set to the far back corner of my basement and park a little further away if it still doesnt come on.

Thanks everyone!

[Bluesman62]

Those sensors are 900 MHz which can pass through objects fairly well unlike 2.4 GHz and 5.8 GHz like you use for WiFi. Wireless data acquisition systems (SCADA) typically use 900 MHz for that reason.

[Peaty]

It takes about 20 minutes of driving I found for the light to come back on when you were near the wheels with the sensors. I swapped to winter wheels and the light goes off about the same time in my commute to work. Comes back on immediately when leaving work but the same thing happens again when I leave home since my OEM wheels are in my garage where I park.

[Leonardo]

^ I agree it is this.

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