is250tx

Hi All,

I just received my new IS250/Luxury Plus/Nav/Mark Levinson with 18" wheels last week.

I had the local dealer put nitrogen in the tires and they inflated them to 35 PSI on all four. The decal on the door states 35 PSI front and 38 PSI rear.

When I asked them about it, they stated they run 35 all around as it's difficult to get the TPMS sensors to accept the differing pressures between front and rear.


Which is correct? I've searched and been unable to find an answer to this question.

Thank you!

15951

The 18" wheels with staggered fitment are 35/38 as you mention. All they have to do is properly fill them, and reinitialize the TMPS. It can be done in 30 seconds from the driver's seat without any special tools. As a matter of fact, you can just do it yourself in the same amount of time it will take the dealer.

The settings button is to the left of and lower than your steering wheel on the dash, and is the same button that cycles through settings for tach/speedo lights, etc.

Incidentally, the rears are spec'd for 37 psi on my 06. Interesting that they added pressure in subsequent years.

soupdawg

not going to make a difference

is250tx

Awesome - thank you for the info.

I agree about interesting how they upped the tire pressure. I noticed a difference in handling when they decreased the pressure in the rear from the 38 with air to 35 with nitrogen. Car seemed a little less responsive on the road to direction changes.

They told me it was difficult for them to set the different pressure between the front and rear tires and keep the tpms from going off. Sounded fishy to me as Lexus would have dealt with that were that the case at the factory.

dojoman

iTrader: (5)

you will not get tpms warning with 3 psi difference.

Byprodrive

iTrader: (1)

I run 38 Front for better treadwear & Handling at the expense of comfort &

35 rear for better ride & handling & tread wear. no problem with TPMS which lights @ 5psi difference

Proper 350

iTrader: (6)

35 all around is fine

noliesss

iTrader: (1)

my TPMS will not go off unless the tires are below 28 PSI. Is this normal to you guys or should I visit the dealership and have them update these? I've tried reseting them to a new 35 front and 38 rear with the button inside the car but as I release the PSI to test it was still the same. Will not go off unless it is under 28 PSI. And I find that at 37 front and 38 rear is the best setting for comfort and handling. Not sure about tread wear because I could not tell the different.

RYLITT

If you're settings are so high and the tpms was set to 37 or 38 then any air that escapes the tire will cause the low tire pressure sensor to light up, so they put it at 28 or 29 since thats the bare minimum that they think you should drive on and then proceed to put air in your tires soon.

dojoman

iTrader: (5)

you can set the tpms by reinitializing using the little button next to steering wheel.

ScKcBc

iTrader: (2)

no one here can get into a car with 35 psi and a car with 38 psi in the same conditions, same tire brand, same car and be able to tell the difference. I'd bet money on that. 10 psi sure but 3 psi is a negligible difference. The weather can change the tire pressure by 5 psi, as well as just driving and letting them heat up. I watched the psi on my fx35 changed 10 lbs last week when i went from home (34 degrees) to snowboarding in VT (0 degrees)