sidgriggs

Last December my low pressure warning light came on. Was told my tires were low due to cold weather and it was reset by my Lexus dealer. June 30, 2006, I have 15,000 mile service on my 06 LX, tire inflation should be checked and set. August 28, 2006, Low Pressure light comes on again--Service dept says all 4 tires were low!!!(it is not cold in Dallas in August) They corrected tire pressure and reset system. I bought a tire gauge, waited until the LX had been parked overnight and checked the pressure--34 to 35 psi in each tire. Panel on door says "29 in front, 32 in rear" so it appears the fix is to put more air than spec in tires to keep the tire pressure light off. Sept 15 I drove to the mountains in New Mexico. Low Pressure light came on before I reached the mountains--Tires were hot, I waited until the next morning (and it was cold outside), but the tire pressure was 32-33 psi--NOT low by mfg specs. The light stayed on for 3 days, then I drove home. On the drive home, the light went off. I checked the tire pressure this morning, all OK. Anyone had a similar problem or is there a problem????

V8_Fan

Did you check the spare? I think the low pressure light includes the spare. I inflate my tires to 34psi in July (95F cold temp in Tucson, 2500 ft alt.), then drove to the Sangre de Christo mtns at 8500 ft, cold temp around 60F. Pressure was 32psi. On my trip to CO a couple of weeks ago, I did the same thing...inflate to 34psi @ 85F cold temp. I don't have the tire pressure sensor, but my feeling is 29/32psi (mfg spec) is kind of low. Mfg ratings are more to give a "smoother" ride. If you load up the car, you should definitely put more air in. I have no qualms running 34psi. As long as the tires wear evenly, you're okay. If you run a cross rotation, they'll last longer than just a front-back rotation (what most dealers do). You only need to do the front/back if the treads are unidirectional. I'm glad I don't have tire pressure sensors on my LX; it would drive me nuts. I'd just disable it.

KiPod

iTrader: (31)

Ditto. I see the spare causing it often.