hziemba

Today is the second time I had my low tire warning come on in my GS300.

The first time it happened was a couple of months ago. At that time, I took it to the dealer who checked everything out and said they could find nothing wrong. When I got the car back, there was no light, and everything was fine.

Today was the second time, and I thought perhaps there was a problems with the tire pressure sensor/transmitters in the valve caps, so I took off all the caps and reinstalled them, one at a time. Unfortunately, the problem is still there.

Any ideas??

4thone

I think if you drop the pressure a couple of pounds then fill to correct psi it will reset itself.

koolaidman

try airing up the tires. u live in nj. when it gets cold u drop pressure in the tires

hziemba

Don't think that would explain the incident in the summer, but may be the case here - I'll certainly try jacking up the pressure.

Does anybody know what the threshold is for triggering the low indication? Tire pressure always goes up after you get going, and in the summer incident, the light was on when I started the car (tires cold), and stayed even after a 10 mile drive on the interestate.

It's a shame the indicator system doesn't show you which tire is the problem, as some other systems do. I had those tire pressure valve caps on my earlier Lexus, and they were great - they had green, yellow, and red, so you knew which tire was the problem AND how bad it was.

cleanm3

yea im having the same thing with my car!. TP warning came on couple days ago. so i took it to discount they just re air all of the tires the same, than yesterday i came on again! i called the dealer they said it might be the spare tire that is off. i'll try and air it today and see what happends. I can't believe its this sensative! I had no problem with my m3 tire pressure monitor.

hziemba

I checked out the tire pressure with a gauge, and found two at 28, one at 27.5, and another at 27. It turns our that the one at 27 was causing the light to come on, because as soon as I got that one up, the warning went out. The manual says 33 all around, with option to add up to 7 for high speed driving, so it appears that the sensor trips at 6 psi under the recommended level. As I said earlier, it really would have been nice if Lexus gave you a reading (or at least, indicator) for each tire.

The temps dropped quite a bit since the dealer checked my tire pressue, so that may account for the drop... I don't think I have an air leak.

I went to the service station the following day, and put them up to 40 psi (I had just driven 10 miles on the interstate, so the tires were hot, and I expect ti to drop 3-4 psi). I'll check them again when they're cold, and drop them down. I was surprised that the sidewall on the tires says 51 psi maximum.

JHStrange

We had the same problem, dealer told me they needed to be at 34psi. Haven't had a problem since.

koolaidman

usually the tpwl will turn on when u have 29psi in the tires. air up all the tires. if u find 1 with a huge difference in pressure more than likly u have a nail in it

Butta

My Low tire light comes on when the temperature drops below 62 or so here in San Diego.

merclexus

my light just came on couple days ago too. all four tires were aroun 27 psi. I'll air it up to 30 to see if that takes the light off.

I also got another light at the same time (and exclamation mark). Is this related to the tire pressure warning light?

koolaidman

no thats ur maintince light

koolaidman

put ur tires at 38. ppl lose an average of 1psi a month even more when its cold

merclexus

OK, so i just aired it all up to 33 psi (i thought that was the recommended psi, not 38?), and all lights are off. Glad I didn't have to take it to dealer for false sensor. So, I guess the exclamation light was related to the tire pressure? I'm assuming that light comes on whenever any other problem signal comes on. I only have 2500 miles on my car, so it couldn't have been for maintenance.

koolaidman

i put them at 38 cuz i dont know of many lexus customers airing their tires them selves