TPMS sensor in spare tire? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

mit_peid · 11-05-2014, 02:24 AM

I have aftermarket wheels but I transferred my OEM TPMS sensors into my aftermarket wheels to ensure I don't get the yellow "!" light in my dash. It has been off for 10,000+ miles but this morning the light came on and all four of my tires are fully inflated. Does anybody know if there's a sensor in the spare?

I know from experience in my 4Runner that the spare is usually the culprit for the light over there. I know I can go into the spare and check too but with the sub etc in the back I'm too lazy to dig through everything.

Does anybody have a similar experience with the TPMS light coming on despite having the sensors in aftermarket wheels after a considerable # of miles driven. The car is still too new to have the TPMS batteries go out.

midnight23 · 11-05-2014, 02:45 AM

no. what psi are they at? just cause they are inflated doesn't mean it won't cause an alert.

wparsons · 11-05-2014, 08:55 AM

Did you actually check the pressures when the light came on? If any tire drops below 27psi (I think, it's in that range), or if there is too big of a difference between tires (5psi IIRC?) the light will come on.

I've had my light come on a few times when the over night temperatures drop a lot.

Get a good pressure gauge and actually check the tires, I'm sure one (or more) is actually low.

N_A · 11-05-2014, 10:55 PM

There isn't one in the spare.

tyrantcf · 11-05-2014, 11:53 PM

I thought the light only came on if the pressure was super super low. If your tires are inflated, one of the sensors might have just gone to shit.

mit_peid · 11-06-2014, 12:53 AM

Thanks guys. I guess the visual and thumb press method doesn't do too well for low profile tires. When I measured them, they were at 28, 31, 31, & 32. The 28 psi tire must have triggered the TPMS light. Once I inflated them to 39-40 psi, the light went away after half a block of driving. I always thought TPMS was kind of a waste of time... I guess they're actually pretty useful when you don't check tire pressure routinely.

dradernh · 11-06-2014, 01:07 AM

This leads me further towards believing that once the automated transport modules have been approved by the federal government, they're going to sell like hotcakes. Make mine an iModule36.5 in Mint Green. With Jennifer Connelly's voice, please.

OT, I know.

11-05-2014, 02:24 AM	#1
mit_peid Boosted Noob Join Date: Nov 2012 Drives: '13 FRS MT KW SC, '05 4Runner 4WD Location: SoCal Posts: 883 Thanks: 353 Thanked 343 Times in 175 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	TPMS sensor in spare tire? I have aftermarket wheels but I transferred my OEM TPMS sensors into my aftermarket wheels to ensure I don't get the yellow "!" light in my dash. It has been off for 10,000+ miles but this morning the light came on and all four of my tires are fully inflated. Does anybody know if there's a sensor in the spare? I know from experience in my 4Runner that the spare is usually the culprit for the light over there. I know I can go into the spare and check too but with the sub etc in the back I'm too lazy to dig through everything. Does anybody have a similar experience with the TPMS light coming on despite having the sensors in aftermarket wheels after a considerable # of miles driven. The car is still too new to have the TPMS batteries go out. __________________

11-05-2014, 02:45 AM	#2
midnight23 dying bird under the hood Join Date: Mar 2013 Drives: 2013 SWP Limited BRZ Location: Disneyland, California Posts: 1,331 Thanks: 546 Thanked 451 Times in 295 Posts Mentioned: 34 Post(s) Tagged: 0 Thread(s)	no. what psi are they at? just cause they are inflated doesn't mean it won't cause an alert. __________________ GReddy Turbo BRZ tuned by Evasive Motorsports Build Thread Instagram

11-05-2014, 11:53 PM	#5
tyrantcf Senior Member Join Date: Apr 2014 Drives: '16 WRX, CBR1000RR Location: Bakersfield, CA Posts: 560 Thanks: 422 Thanked 369 Times in 213 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	I thought the light only came on if the pressure was super super low. If your tires are inflated, one of the sensors might have just gone to shit. __________________ Phantom ESC'd Build Thread (Retired):http://www.ft86club.com/forums/showthread.php?t=75293

11-06-2014, 12:53 AM	#6
mit_peid Boosted Noob Join Date: Nov 2012 Drives: '13 FRS MT KW SC, '05 4Runner 4WD Location: SoCal Posts: 883 Thanks: 353 Thanked 343 Times in 175 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	TPMS sensor in spare tire? Thanks guys. I guess the visual and thumb press method doesn't do too well for low profile tires. When I measured them, they were at 28, 31, 31, & 32. The 28 psi tire must have triggered the TPMS light. Once I inflated them to 39-40 psi, the light went away after half a block of driving. I always thought TPMS was kind of a waste of time... I guess they're actually pretty useful when you don't check tire pressure routinely. __________________

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