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Old 05-05-2010, 08:17 PM   #1
DCsubieSTI
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Default tire pressure lite 09 sti

Tire pressure lite has been on my car since I bought it used. It was on when I came to pick it up off the lot so I told the guy to fix it so he checked the tires said a few tires were alittle of so he fixed all the air pressure and even hooked up the ecu to a computer real quik and the lite went away. 5 miles down the road the light started flashing and then stayed on steady. Today I took it in to have my oil changed so I had them fix the tpms warning light also. He called me back said they pulled a nail out of one tire and the light went away. 5 miles down the road once again it started flashing and now its on steady again. I'm so over the stupid light and driving back and forth to the dealer. Any ideas of what it could be? Anyway to disable the tpms sensors? Will cobb ap clear a tpms light?
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Old 05-05-2010, 08:30 PM   #2
munkis
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check your tire pressures
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Old 05-05-2010, 08:30 PM   #3
humperdinc
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I have an 09 WRX and a Cobb AP will not clear a tpms light. And I believe that there's no way of disabling the sensor (weird but may be true). My suggestion is check the pressure in all four tires. If they are below 32psi, put in some air and bring it up to 32. Drive your sti for a few miles and the light should clear. If all four tire pressures are at or above 32psi and you drove around for a few miles, and yet the tpms sensor light stays on, then your sensor is dead or may need to be recalibrated. Try calling a dealership service department and ask them if this problem will be fixed under warranty.

Hope this helps.
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Old 05-05-2010, 08:32 PM   #4
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please stop calling it a lite . . its light lol

have you checked your tire pressures ? check the OP manual for correct factory pressure ( should be 32 ) as that is what the sensor will relate to.

if he pulled a nail out of your tire, dont you think you may want to get that checked out as well.
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Old 05-05-2010, 08:38 PM   #5
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I would be upping the pressure, nothing wrong with 34 or even 36Psi...
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Old 05-05-2010, 08:40 PM   #6
06AWD
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Quote:
Originally Posted by munkis View Post
check your tire pressures
It's the simplest things.
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Old 05-05-2010, 09:01 PM   #7
DCsubieSTI
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I also swapped the tires for snow tires over the winter and the tpms light was still on. At this point I know its a faulty sensor. I'm ready to kill the dealer
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Old 05-05-2010, 10:03 PM   #8
lemmonsqueeze
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I worked in a tire shop for a couple years.
as far as I know it is illegal to remove any federal saftey feature.

the TPMS units in my experience allways read low which is annoying because then people end up leaving the light on or inflating them higher.

some systems will go off if the pressure is too high also

the pressure it says to fill it up to, is a cold temp which if you drove somewhere means that the air in your tires is hot. If you are running regular air as opposed to nitrogen, add 5 or so psi.

I don't know if the sensors fail on or off.

there could also be a slow bead leak or something like that

good luck
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Old 05-06-2010, 03:31 AM   #9
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go 35-36 psi, max is 40 I believe on the stockers.
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Old 05-06-2010, 08:25 AM   #10
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god i hate TPMS.. if it were me, i'd replace them all with regular valve stems and take out the bulb from the cluster.

anyway back to the OP's problem, it could be the sensors need to be re-calibrated, i think they have some kind of special tool at the dealer where they can check to make sure that the car's computer is reading all the sensors correctly.. this way they can figure out if one of the sensors went bad and which one it is.
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Old 05-06-2010, 04:39 PM   #11
orfsubarupartsdude
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The dealer has to check each and every tire sensor.No way around it.....just checking one will not clear the light.
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Old 05-06-2010, 05:06 PM   #12
JustinV
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If your tires are overfilled it will also cause your tpms to show up.
If it's gotten hotter recently then that could cause your pressure to go up and set your tpms off.
I really wish I didnt have them, it's not hard to just check my tire pressure regularly.
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Old 05-06-2010, 05:36 PM   #13
DCsubieSTI
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the tpms lights been on for 2 diffferent sets of tires, winter weather, spring/summer weather. its very annoying. the door jam says 32 psi cold and the manual says that when a tire warms up it should increase by 4.3 psi. i checked the tire pressure a second ago while they were warm and they were all at 40 psi. so i put them all down to around 37psi. im gonna let them cool offf and recheck them all. this all seems way too complicated for stupid tpms lights

Last edited by DCsubieSTI; 05-06-2010 at 06:03 PM.
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Old 05-06-2010, 06:33 PM   #14
sniper1rfa
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Are you sure the TPMS sensors are even in the wheels? How are you swapping tires?
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Old 05-06-2010, 06:46 PM   #15
DCsubieSTI
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mavis swapped the tires........dealer looked at them twice and hooked the laptop up real quik and all that. both times the dealer looked at it the tires were cold and the light went off for a good ten minutes. once the tires warmed up on the highway BAM! that same stupid light staring at me again
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Old 05-06-2010, 08:19 PM   #16
79tranny
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Quote:
Originally Posted by bugeye829 View Post
god i hate TPMS.. if it were me, i'd replace them all with regular valve stems and take out the bulb from the cluster.

.

but americans waste MILLIONS of gallons a year because idiots don't know how to use a damn tire gauge and run on low pressure.

so they need an idiot light to tell them to maintain that vehicle they abuse everyday

anyways.. the tire pressure should be at 32psi, which will increase 4.3psi when warm.. so im sure even the best wouldn't get exactly 32psi, but even so, if the max is 40, thats a pretty small window huh?

i'm not arguing it, i just didn't know that.

(just ignore my ignorance.. haha i'm not trying to jack your thread OP)
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Old 05-06-2010, 08:21 PM   #17
G8r
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what did they say?
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Old 05-06-2010, 10:15 PM   #18
DCsubieSTI
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Quote:
Originally Posted by G8r View Post
what did they say?
Each time the supposedly fixed it untill I was 5 miles away and the light returned.
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Old 05-06-2010, 11:37 PM   #19
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My light was on when I bought my wrx brand new frpm northpark toyota. The service tech told me that about 90% of them are faulty and will never work right. So, I took my car to discount tire for a second opinion and they fixed it! Apparently one of my sensors had been stripped out when installed at the assembly plant.
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Old 05-08-2010, 01:10 AM   #20
circlek
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the tire pressure should be at 32psi, which will increase 4.3psi when warm.. so im sure even the best wouldn't get exactly 32psi, but even so, if the max is 40, thats a pretty small window huh?

Thats 40 PSI cold, they know pressure goes up when they're warm. Have the light reset, set your pressure at the factory setting. Go out and drive it, if the light comes on and the pressure hasn't changed more than the 4 PSI, you have a problem with a sensor more than likely. TPMS lights come on at 25% change from factory pressure settings.
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Old 05-08-2010, 11:12 AM   #21
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The light is not all that bright or annoying, if you don't obsess over it. I have 4 sets of wheels and only the OEM ones have monitors. The light doesn't bother me at all. Ironically, my OEM wheels have my track tires on them and by the 3rd lap the light comes on from over pressure. **** the goobermint and their ******* monitors.
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Old 05-08-2010, 11:43 AM   #22
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Quote:
Originally Posted by irshkid72 View Post
the tpms lights been on for 2 diffferent sets of tires, winter weather, spring/summer weather. its very annoying. the door jam says 32 psi cold and the manual says that when a tire warms up it should increase by 4.3 psi. i checked the tire pressure a second ago while they were warm and they were all at 40 psi. so i put them all down to around 37psi. im gonna let them cool offf and recheck them all. this all seems way too complicated for stupid tpms lights
I have an 09 Legacy and with the stock tires on there my light does not show because I have the sensor attached to my stock wheels. I put on my summer wheels and my light stays on all the time. If you have a faulty sensor or you don't have a sensor on there at all it will light up all the time. If you never had the sensor installed on your winter tires that explains that one.
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Old 05-08-2010, 05:40 PM   #23
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I really hate that god damn TPMS light. I was driving to the airport with someone and I happened to hit a nasty pothole. Ever since then the light likes to stay on even though the pressure is correct.
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