Last night, our countryman low tire warning came on, indicating the left rear tire was low. I looked over the tire for punctures, checked the tire pressure for all the tires, but everything looks fine. I reset the TPM, but is there anything else I'm missing? This is the first car I've ever had with run-flats, so wasn't sure if I'm supposed to do anything else. I'm sure some people say this would be a great opportunity to just replace the run-flats! I've also read the threads saying that sometimes false positives occur because of the weather, but it's only 55 here in San Francisco.

 

nope, had that happen to me the other night. it was our first cool night, mid to high 40s, MINI sat outside for hours while we were in with friends. light came on... by the time I got home the tire was warm so the pressure increased slightly I'm sure. reset it and it was fine. the pressure was about 1 lb low when I got home, so figure maybe 2 or 3 lbs low when I first started it, before the tires warmed up on the 30 min drive home? I put a couple lbs of air in and have had no further issues.

 

I had same issue. Got low pressure warning for 1 wheel first then for all 4.
Checked pressure and it was all good.
After reinitializing TPM system it all went away.

Looks like some bug in TPM...

 

it happened to me a while ago on a cold night too. I reset the TPM and so far no problem with the tires. It should be just a false alarm

 

It happened to me too. Question - I have all season tires and I have read on this forum about people still putting winter tires on. Shouldn't the all seasons be good for winter too?

 

All season tires are the jack of all trades, master of none.

If you want a true performance tire, get summer high-performance tires. But understand they won't perform well in snow and maybe not so great in rain.

If you want the best traction in snow, get winter tires and swap them on and off with your summer tires.

If you want to run the same tires all year and not mess with changing them, and you don't think you'll do much driving in more than a couple inches of snow, just go with the all season tires.

 

Never ending debate, but my opinion and personal experience is that all season tires are the toyota corolla of tires. Does everyting OK but not great at anything.
If you drive in a lot of snow or ice, winter tires provide a great improvement in traction, and more importantly, braking. I personally don't care how fast I get going when driving in the nasty stuff, but I do care about better control and being able to stop faster.

 

The last couple of brochures from tire mfrs I've read have them clarifying "all season" as pertaining to the tread compound being able to maintain some level of grip in cold weather. "Light" snow, if mentioned at all, and I'm thinking they mean that first light powder that blows across the road. :-)

My experience with the last two sets of all-season tires sold with a new vehicle: they sucked in snow, "M +S" labeling notwithstanding. Toyos and Bridgestone OEMs (both on Mazdas), close to immobilized in 2-3 in. of snowfall on my driveway grade (typical suburban setting, nothing drastic).

Real winter tires were night/day in both instances. Snow-rated tires these days will have that little "mountain with a snowflake" symbol. At least one all season tire (Nokian WRG2) has this "severe service symbol", there may be others. Dedicated winter tires should have the mark, of course.

More here:

http://www.tirerack.com/tires/types/snows.jsp

 

Happened to me a few weeks ago. After a summer of many days in excess of 100 degrees, we had our first "cold" snap when the nighttime temp dropped to 59. Warning light came on the next morning - all four tires were about 6 lbs low.

 

About once a month it comes on- always rear passenger tire. No rim rash- or other obvious issue. I check the air, add a couple of PSI and off it goes. I will have the dealer look at it when I hit the 15M mile service.