iLoveMyIS

At 1300 miles, my low tire pressure light already came on!

I checked all tires when I came home (hot, not cold) and it was at 30psi

What should the cold tire pressure be?

My owners manual is at work.

Evitzee

Check the label on your door jamb. It states the recommended psi. Federal law mandates the sticker!

dat-is350

iTrader: (2)

that means, you have to pump some air in it? You normally check your tires when its cold. So at cold it should be around 32, but I do 35 front and 38 back.
When you checked it and it was 30 hot, it must have been somewhere around 27 28 cold.

onepointon

we have been getting killed with tire pressure lights at work. its not abnormal for it to come on.

what you need to do:

1.) when the tires are cold, set it to whatever the sticker on the door jam tells you to.
2.) to the left of the steering wheel, you will see the display scroll button. scroll through the options displayed on the gauge cluster until you see the word "initial". when you get to that, press AND hold it until the tire pressure light stops flashing (it will blink 3 times). this is done with the key on.


this reinitializes the thresholds of the tire pressure warning system. also, make sure not to accidentally hit the "2nd set" button. ive seen people do that as well. if you have a tire that is a lot lower than the rest of your tires, make sure there is not a nail stuck in it. if they all read 30, just readjust them and intialize the system as i said above. initializing the system is important.

of course you could take it to your dealer and have them perform this. each dealer is different, but i believe we havent been charging customers for TPWS complaints unless there is a punctured tire.

hold that helps.

Bichon

30psi is way too low. Proper pressure, from the door jamb as others suggested, is 35 front and 37 rear.

IS250SoCal

Anyone know if the tire pressure can affect the VSC? From the info I get it sounds like it can.

sirCharles

just use a little more air and forget about it. I use 37 front 39 rear on stock setup. Rides perfect, with good tires.

Also, better gas mileage with more air in general. I saw it on a show. The guy that has a book about hyper-mileing.

IS250SoCal

I almost use the same set up. Except 36 psi in front.

I'm just wondering cause for the past week, I have had a slow leak in my right rear tire and just yesterday my "check VSC" light came on.

I tightend my gas cap and still nothing. I'm gonna go put 2 new tires on but just wanted to see what y'all had to say.

onepointon

hm, its hard to say if a flat tire is causing that or not. there will be a VSC code stored if the light is on. if you get that code and report back what it is, i might be able to help you out. best bet is to take it to the dealer and see what it is. if there is an issue, it should be covered under warranty.

Brian231

THE TPMS is designed to alert the analogue guage cluster if it senses a 3 psi drop from intial calibration

Bass Mech

i set all my tires to 32 psi, then calibrated the TPMS then i added air to the specified limits so i have a margin of safety. now the TPMS will only come on if the tire is actually low rather than it being affected by temperature.

onepointon

I think this is a good idea if you do it yourself. My dealer flirted with the idea of doing this exact same thing because we get so many tire pressure light concerns. We decided it was a liability in the case someone has a blowout or something out of the ordinary. We just initialize them as the factory recommends (what I stated above).

If I had a car with this system, I would do the same.

Brian231

I would like to recomend having your tires filled with Nitrogen in order to reduce the frequency of the light coming on. Since I live in Chicago, our winters can be rough with exreme temps. The molecules of Nitrogen are much larger than oxyge and thus, do not seep out of the tire as fast subsequently retaining proper inflation longer. The only downside, if you at Oxygen after the fact, you will have to have the tire flushed again and Nitrogen added. Most dealers offer lifetime top offs. it is worth the $50. Almost all aircraft have Nitrogen filled tires due to the high altitudes and the fact that wheel well housings in an aircraft get brutally cold it is all really a safety issue.

IS250SoCal

Thanks. Do you know where I could find the code?

Bichon

If you have access to a OBD-II scan tool, the diagnostic connector is near the drivers left knee. Otherwise you'll need to bring it to the dealer or a shop that has one.