2010 JK unlimited. Do I need the TPMS sensor in the spare to get rid of the idiot light?

One dealer says I only need the TPMS in the 4 mounted tires. Another says I need them in the 4 mounted tires PLUS the spare to clear the idiot light. Anyone know conclusively if I need 4 or 5?

Will sensors from an 07-09 work on my 2010 without flashing the computer? Again, mixed info on this. I'm NOT doing a "transfer" of my old sensors but putting in take offs from an earlier model. My original wheels have the black TPMS sensors. Will the grey ones work as well? Will my JK learn these 'takeoffs' without having to flash the computer?

This TPMS stuff is frustrating. I don't mind the idiot light, but the wife thinks it's a dire issue. Gotta keep the wife happy.

ack....

 

Five in case you want to rotate that as well.

 

you will need all five to prevent the light from coming on

 

According to the owner's manual the TPMS does not monitor the spare wheel and tire. A spare wheel and tire with a low tire pressure condition will not trigger the TPMS warning light. TPMS only monitors the four active wheels and tires and will recognize the spare when swapped in. If you have a TPMS warning light and swap in the spare or air up your tires to correct low pressure it may take up to 20 minutes of driving at above 15mph. As for the compatibility issue, I have no idea if a reflash is required.

 

Buy the AEV Procal for less than the sensors and do away with that BS altogether.

 

Good luck with that!

 

I've a 2010 Rubicon Unlimited with aftermarket rims and TPMS sensors in the 4 running tires. I didn't put the sensor in the spare and my TPMS works fine. Not sure why people here are posting that the system monitors the spare. I'm in Canada... maybe it's different in the US? I know certain states have their own new vehicle safety equipment requirements.

Do 4 and if the system won't turn off with all 4 tires at 40lbs then you'll have to add the spare I guess. Also, if you want to clear fault lights you need to sit in the vehicle with all doors shut, turn the ignition to accessory, and jam the gas pedal to the floor 3 times. Not sure this works for TPMS but It does for stuff like the maintenance warning.

 

TPMS only monitor the 4 rolling tires. When you crank up and start rolling the sensors detect their own movement and start reporting the pressure. If the computer logs 4 sensors with good pressure the light will not come on. If you only install 4 you will be fine until you either get a flat and swap in the TPMS-less spare or until you rotate the TPMS-less spare onto a wheel.

There is some debate on the frequencies. They are either 315MHz or 432MHz. The easiest thing to do would probably be to contact your dealer or local tire shop. Request a quote for 4 or 5 TPMS sensors installed. The quotes will have part number and price. On a 2010 it is probably the 432MHz sensors.

There is also debate on computer learning. Some say the WCM will learn sensors. Other people state you need to have the sensor IDs flashed to the computer. Get sensors. If the light does not go out after a week or so, visit a tire shop and get the computer flash.

 

Ok more confusion to the mix. From what I understand, the AEV Procal can NOT eliminate the idiot light if there are NO TPMS SENSORS mounted. Is this correct?

You can only use it to lower your PSI , so the light won't go off when running lower psi WITH TPMS sensors mounted. BUT, if there are no sensors in the wheels at all, the AEV Procal will NOT disable the WCM and the idiot light.

Again, anybody know conclusively?

 

Ok. So is there consensus on this statement. ONLY 4 sensors need to be mounted on "4 rolling tires" for the idiot light to go out? The spare does NOT need a sensor and will NOT trigger a tpms warning light on the dash?

I'm TPMS'd out!