I picked up my Clubman September 12. Have had the tire sensor warning light go off twice on different tires. The last time I added nitrogen to a tire was about 10 days ago. Yesterday morning the sensor goes off for a third time indicating that ALL of the tires are low. About 7400 miles on the car, nitrogen filled tires.
Does that sound normal to you?
Thanks!

 

Have you reset your TPMS ? I only had mine go off for one tire when it changed to cold weather. I would fill your tires to 34-36psi and reset. Don't fret the nitrogen, air is mostly nitrogen anyways. Lots of discussion on how much of a waste it is.

So do that and then if it happens again and your tires are low you have an issue.

 

Notwithstanding the sensor warnings, are the tires actually losing air? If so, you have a problem with the tires. If not, it sounds like a sensor issue.

 

5,000 miles since January and sensor has not gone off yet. I check frequently and have added a few lbs. to one tire one time only.

 

How much pressure do you have in your tires?
How low did it drop when the TPMS warning went off?

Just buy a quality air pressure gauge, and keep the tires inflated to at least 35psi all around, and watch them for air loss for a few weeks.

If you loose more than a few psi per week (shouldn't be any loss, but most gauges have a 1 psi margin of error), you have a nail or a leak that should be fixed. I usually have to fill my tires once a year - late in the fall when the ambient temps drop and take the air volume in the tires down with it.

a

P.S.: Nitrogen fill is BS. Atmospheric air is 78% nitrogen.

 

I personally check tread depth and air pressure monthly. When the cold morning air temps fluctuate, I adjust my pressures accordingly.

 

Where do you live? Here in Arizona our temps can start out in the 50s in the early morning and soar to well over a 100 later in the morning. That messes with tire pressure. I know the tires are smaller but when my son races motocross I see tire pressures increase by as much as 5 psi within about 2 hours as the day warms up. That is a huge difference when you are running 13-14 psi in a tire. I have not tracked my MINI tires yet but I may start now just to see the difference. I just check mine about once a week in the morning. I would go nuts trying to keep my tires pressure correct all of the time. Add more air in the morning, let air out in the afternoon.

 

For competitive events, you would be checking and adjusting tire pressure before and after each run! And they will be changing in between! Never mind daily or monthly.

For street cars, unless there is a leak (then fix it!), I have not noticed any fluctuation in tire pressure throughout the tire's season (summer vs. winter tires), when measured in the evening inside my garage. I do check and adjust them before a winter or summer set of wheels+tires go on the car.

If you are stuck with using the same set of tires throughout the year, you would need to add more pressure in the fall when temps trend towards freezing. Other than that, modern tires are remarkably consistent.

a

 

I find that my passenger front tire requires regular air pressure changes. Being the tire with the toughest wear, I find a loss of 1-2 lbs a month. It's this way for me on both my winter tires and wheels as well.

Bottom line here is keep on the pressures, they can vary.

It's not strange to loose 1 pound a month in regular service. Every 10 pounds of air temperature change accounts for 1 psi.

Though you may have a huge temperature fluctuation within a day, you should be setting your tire pressure to the coldest morning air temperature. Make sure your tires have not been sitting in the sunshine for a long period, as this will falsely raise your cold tire pressure.

 

this simply can NOT be happening

the dealer told me the entire REASON for the nitrogen fill was it would NOT leak out!


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sorry

couldn't resist

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if you keep loosing pressure and there is no nail or other puncture, check your valve stems. Take the valve stem caps off. Get some soapy water and wet the stem area. Bubbles indicate an issue. Would not be the first time I saw loose valves in the stems. Easy to fix . . .

 

I am fairly sure my cores and stems are tight, but I'll humor you. Will report back

 

i check my tire pressure once a week

have to add a pound or 2 every 4-6 weeks, i believe because checking the pressure lets a little air out!

any more than a pound or 2 of air loss a month would have me looking for a cause, an object in the tire, loose schreader valve in the valve stem, loose valve stem into the TPMS sender or a rim leak caused by damaged rim or corrosion