had this happen to me today. Kinda standard car wash (and I've been through this one before). After the blower dried the car, I noticed the tire pressure sensor light on. Got back to the office and all tires and caps looked normal. I reset the sensor, and will drive it shortly (and let you know if it goes off again).

anyone else had this happen?

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Comment by Michele on August 8, 2009 at 3:29pm
Just a heads up, I was told by my smart dealership and other people not to take your smart through a car wash because it can damage the car.
Comment by Tori on August 6, 2009 at 2:27pm
Al, these TPMS operate on 433MHz band and most wireless phone are either 900MHz, 2.4GHz or 5 GHz variety, maybe buying a new phone with a different frequency band will help?
Comment by Dan O on August 5, 2009 at 5:36pm
Kevin, if you reset the TPMS with the tires cold you've effectively moved the 'set' point lower. That means you'll not sense any problems after they heat back up until the pressure has dropped below the 'new' set point. I think the right procedure would have been to drive to warm them up without resetting the system. . . and then the light should have gone out. I had the same thing this past winter where the days are in the mid-70s but nights are in the 30s - and the sensor would come on. The next day it would be off. . . and yeah, we have 30 degrees at times in Florida.
Comment by Al Glover on August 5, 2009 at 3:46pm
Mine was set off by my wireless home phone (it also set off the alarm). This happened twice. Now, we move away from the kitchen window when we answer the phone. I did go to the dealer, and they said it isn't that unusual - something about the radio frequencies involved.
Comment by Kevin Causey on August 5, 2009 at 12:46am
very good to know. I'm in PHX, so it was only 110 outside when I went through the car wash. I'm guessing the sensor went off as it should have, given the tire pressure dropping 3PSI or so upon the rapid cooling effect of water being dried off the tires with blowers. Makes perfect sense from a physics perspective. Once I reset the sensor, I haven't had any issues (drove 30 miles home in 105 degrees on the highway, no problemo).

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