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Every time the temp falls below 40 degrees (which is obviously happening more and more, and will happen probably every day beginning in January), my tire sensor warning light comes on in the morning. At first it freaked me out, and I would manically check the air pressure, put air in to make sure everything was just right, etc. But after doing that 2 or 3 times I realized ... duh ... the pressure is low because of the cold. Sure enough, after 3 - 4 minutes of driving, I could simply reset the sensor light and everything was fine.

So, here are my questions:

(1) Anyone else having this issue?
(2) Is there a way to set the sensors so that they don't freak out every morning?
(3) Should I care about this, or should I just consider it yet another "oddity" (like the "always on" radio) of my Smart.
 

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As the temperature continues to drop, I find that I need to add air almost weekly to compensate for the drop in tire pressure. Check tires in the morning when they are cold and out of the sun. If you add air, be sure to reset the button on the dash. This should solve your problem.:)
 

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Thats crazy

I wonder if thats what they do in France and Canada where it is really cold already? Makes :cool:me wonder if I should have ordered sensors on mine?
Is yours a 2008 or older too?
Se




me out, and I would manically check the air pressure, put air in to make sure everything was just right, etc. But after doing that 2 or 3 times I realized ... duh ... the pressure is low because of the cold. Sure enough, after 3 - 4 minutes of driving, I could simply reset the sensor light and everything was fine.

So, here are my questions:

(1) Anyone else having this issue?
(2) Is there a way to set the sensors so that they don't freak out every morning?
(3) Should I care about this, or should I just consider it yet another "oddity" (like the "always on" radio) of my Smart.[/quote]
 

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The pressure change in the tires is perfectly normal. :) All tires on all vehicles will change in the weather.

(I kind wish I didn't have the sensor on my car. I think it makes me a bit more paranoid than I need to be or was with past cars.)
 

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The volume of air in these tires is a bit less than most folks are accustomed to. You may notice that it takes less time to add a pound or two to the smart tires and it does on a larger vehicle.
That low volume tends to make them a little more susceptible to pressure vaiations due to temperaturere.
If you adjust your tire pressure when the tires are cold (before driving one mile), and reset your TPMS system, you should be good until the temperature drops significantly.
I personally don't buy into the nitrogen thing, but maybe using nitrogen will keep those pressures more stable as the temperature drops.

. . . or maybe I'm just full of it! :)
 

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ShoshTrvls, TPMS warnings aren't specific only to smarts. We travel with, test and market all sorts of different cars all over the country (and Canada) and it's a fairly common thing to see when the weather first turns cold, especially if the tires are right at or a few pounds below recommended pressures to begin with. Just air them up to recommended pressures (see door jamb label) when they're completely cold and your TPMS warnings should disappear.

Cheers,
Arch

PS, Nitrogen is a complete waste of money.
 

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Oh Noh...I'm loosing my powers of persuasion...oh well
happens when you get oldER....
Did I said I love N2.....is free for me....

jetfuel
 

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FWIW, I've been noticing this phenomena for the past 7-10 days. While I live in north Florida, and it hasn't been THAT cold yet. Our lowest temperatures have been in the 50s. I'm going to follow the suggestions to air up first thing in the morning, when the tires & temps are lowest.

I'm glad this topic was brought up. I was getting a little concerned, but I figured it was probably temperature related and just haven't gotten around to adjusting the pressure yet. The indicator light goes out after a few miles of driving for me too.
 

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NCC1701..can you do a quick experiment for us...
check the tire pressure early in the morning before fill up and then again late in your sunny/warm/beautiful FL afternoon? (damn..I hate you) j/k...and see what the difference or gain in pressure is...I'll do it here but we are in cold weather already and the change from morning to afternoon is not that much.....

jetfuel
 

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NCC1701..can you do a quick experiment for us...
check the tire pressure early in the morning before fill up and then again late in your sunny/warm/beautiful FL afternoon?
jetfuel
I'll endeavor to do that tomorrow and take notes of the measurements.

About your impression of my weather, I wish you could take it. I hate having HOT, MUGGY weather for 7 to 9 months of the year. THIS is my favorite time of year in this part of the country....
Tonight
Partly cloudy becoming mostly cloudy after midnight. Lows 47 to 52 :). Northeast winds 5 to 10 mph.

Wednesday
Mostly cloudy with a 20 percent chance of afternoon showers. Highs 70 to 75. East winds around 10 mph with higher gusts near the coast.

This is North Florida, not Miami.
 
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