The low tire pressure light came on but how come it doesn't indicate which tire is low? I filled air on all 4 tires. Driving for about 15 minutes, the light is still on. How long does it take until it disappears?

 

Should go away almost immediately after the offending tire is brought above the minimum pressure threshold for the TPMS sensor.

I came out to my car a few weeks ago and it gave me that warning, I drove to a gas station and filled up all the tires (the fronts were the only ones that were especially low), and as soon as I turned the car back on after filling them, the warning was gone.

 

Yeah, same thing happened to me too today. Was wondering how to tell which tire was low. So I went to a gas station and checked each tire and found the low one. Put air in it and the light stayed on for about 1 min and when away.

 

check the spare tire?

 

It would be nice if it shows which tire is low so we don't have to check every tire. The light finally disappeared after about 15 Km (9 Mi) of driving.

 

^^^ Your tire pressure prob right on the edge of the "right" pressure & after 9 miles the tire got warm & the tire pressure built up. It prob will come on since it's prob getting a tad cooler now up there. Mine came on one chilly morning & went away after i drove on the freeway for a bit. It came on again so i just added a few lbs of air been fine since. If you run 35lbs or a bit higher you should be fine. Mine comes on about 33lbs..

 

Always a good idea to check the air in the spare, but it has nothing to do with the TPMS warning light. There is no sensor in the spare.

 

When I checked my 2 fronts they were both 30 psi. I fill my tires with air to OEM specs (35 front, 38 rear).

 

Check for leak. Mine did the same thing and when I checked found a huge bolt stuck in the middle.

 

Not sure where you guys live but with the weather changing soon and temps getting cooler/colder the tire pressures are going to register lower so those on the border of the correct PSI's are going to get this warning. Might best to fill up a little lbs above the border to avoid this warning ?

 

Remember the OEM recommendations are for cold tire pressures. In my experience, tire pressures read anywhere from 1.5 to 2 psi higher when warmed up.

I usually fill up my fronts to 37 psi and my rears to 40 psi (warm - which is inevitable if you've been driving or are driving to a gas station), and then release air the next morning to OEM "cold pressure" specs as needed (35 front, 38 rear) once all four tires have cooled down sufficiently.

 

Odd a Cheyy Equinox has the pressure reading per tire and a Lexus doesn't except for the LS and maybe other high end models.

 

With cigarette lighter powered tire inflators selling for less than $20, it makes sense to fill your tires when they really are cold. I have an inexpensive Campbell Hausfeld that I picked up at Walmart that works fine. http://www.amazon.com/Campbell-Hausf...pr_product_top