over the last week or so its been getting colder here in nj...& ive noticed that my tpms sensor is coming up with the low tire pressure....3 days ago it did this but after driving to work the lights went off like it was back to normal. This morning it happened again

Just curious is this normal when its cold outside ? or is it possible im having a tpms issue ?

wierd this is happening the 1st day of cold weather here in jersey

 

when cold the pressure is lower so this can happen (happened to me before)

 

So what have you done just keep riding to warm up the car & it goes away ?

 

i'd check the tire pressure with a gauge and refill with air if necessary. the air inside tires heat up and expand after u drive for a while so that might be why the light goes out after a while. if it's low enough in the morning to trigger the light tho, at least one of ur tires are low on air.

 

happened to me couple wks ago. pumped all up to 35 psi and warning gone.

i would check the pressure when cold and fill air up to proper psi. i don't think you have tpms issue.

 

This kept happening to me, I decided to get nitrofill have yet to have it happen to me again and that has been since 2006, for very car I have owened. its worth it.

 

I see the same thing. I add two extra PSI

 

tire pressure should always be measured cold. i will make sure in the morning when it's cold and the pressure it's above the threshold

 

Happened to me on my 2008. It sat outside for a week without use and there was a decent temperature drop from 50s to 30s at night. One of the tires got down to about 31psi. Put it back up to 33 and have not seen the light since (knock on wood).

 

It happened to my Accord 08 whenever it get very cold in the morning. even after I bought it to the dealer. They told me it is normal for cold weather

 

Its the weather when its cold out ur tire pressure light comes up u have too set it under the driver seat.i don't know how but if u look it up u can find how to do it

 

I do not know what year your vehicle is, but with both of mine I just have to bring the pressure up to the rec ommended pressure and the light will go off after you restart the vehicle. It would help to add a couple of extra PSI to cover temperature fluctuations. My vehicles are a 2010 and a 2011.

 

same thing here. And when it warm up a bit I'll go pump up the tires. Tires do leak a bit.

 

Welcome to the world of physics.
Tires will lose 1 psi for every 10 degree drop in ambient temperature.

For example, a tire's pressure was set to 32 psi in a setting that was warm, lets say 70 degrees (could be a warm summer day or inside a tire shop bay) and the system was initiallized at 32 psi. Now measure that same tire in a setting that is cold, the pressure would be lower. If it were 30 degrees outside the tire should give you a pressure reading of about 28 psi. I think the TPMS system in Lexus gives us about 4 psi of wiggle room. Once the tire's pressure goes below 28, it should set off the light. Today, it was 12 degrees when I went out to work. If that were my tire, then it would have read around 26 psi if I put a guage on it.

Once you start driving, the rotaiton of the tire causes friction between the road surface and the tire. Friction creates heat, heat raises the temperature of the air in the tire which in turn causes the tire's pressure to increase and then the pressure light goes out after driving for a while.

Best thing to do: when it is cold outside, bring your tires up to your desired psi and then re-initialize the system. You should be good for the rest of the winter. If the light comes on and stays on again after that, check the tires for leaks and physical damges.

I hope this helps.

steviej

 

Don't forget about you spare also. If that is low it will trigger it also. I know the early tc's had a little issue with them. Toyota recommended to let the air out of the tires wait a bit then refill. Seemed to work on a friends 06 Tc. Her light stayed on even with correct pressure. I know that's not how you reset but it worked.