[Aronis]

Just FYI....
Since the temps are dropping the tire pressures are also. LOL...

I had my first run in with the Low pressure warning (all four tires down at 29 psi or so) due to cold weather. The car goes into Comfort mode and stays there until you reset the system. I just reset it and was able to drive as normal and was surprise the warning did not come back on even though I had not yet added any air. It read the same low pressures after driving a few miles, but did not trip the warning...Odd.....

I got home and fired up the compressor and brought all four back to 35 psi. Then when I drove again the system measured 32 or so on the tires.


When the warning is on the car is limited to 80 mph. Oh Darn!

Just FYI....

Mike

[MagnusT]

My car shows incorrect pressures on the screen. 0,1 to 0,2 bar lower than actual pressures.

[M3 Adjuster]

Originally Posted by Aronis

Just FYI....
Since the temps are dropping the tire pressures are also. LOL...

I had my first run in with the Low pressure warning (all four tires down at 29 psi or so) due to cold weather. The car goes into Comfort mode and stays there until you reset the system. I just reset it and was able to drive as normal and was surprise the warning did not come back on even though I had not yet added any air. It read the same low pressures after driving a few miles, but did not trip the warning...Odd.....

I got home and fired up the compressor and brought all four back to 35 psi. Then when I drove again the system measured 32 or so on the tires.


When the warning is on the car is limited to 80 mph. Oh Darn!

Just FYI....

Mike

When you reset the system then you simply reset it to a lower value.

The alert occurs when there is a delta below the pre-set psi.

In other words. If the set tire pressure is 35 psi then the alert would come on after dropping more than 5 psi.

When you reset the tire pressure norm to 29 psi then the pressures would need to drop another 5 psi below the set level of 29psi down to 24 psi or lower for there to be an alert for low pressure.

So, while resetting the pressure got rid of the alert temporarily , you would want to add pressure soon ( as you did ) and then reset the system again so that you don't damage your tires while driving with them underinflated.

It's nice when a car gives an alert for low psi but sucks that it also puts you into the comfort mode " penalty box " as well.

[Aronis]

Originally Posted by M3 Adjuster

When you reset the system then you simply reset it to a lower value.

The alert occurs when there is a delta below the pre-set psi.

I figured as much, i put more air in when I got home and reset it again.

Mike

[andrettifan]

Originally Posted by Aronis

Just FYI....
Since the temps are dropping the tire pressures are also. LOL...

I had my first run in with the Low pressure warning (all four tires down at 29 psi or so) due to cold weather. The car goes into Comfort mode and stays there until you reset the system. I just reset it and was able to drive as normal and was surprise the warning did not come back on even though I had not yet added any air. It read the same low pressures after driving a few miles, but did not trip the warning...Odd.....

I got home and fired up the compressor and brought all four back to 35 psi. Then when I drove again the system measured 32 or so on the tires.


When the warning is on the car is limited to 80 mph. Oh Darn!

Just FYI....

Mike

I'm in the same general part of the world and temps are falling. If the pressure warning comes on, where / how does it show... and how do I reset it?

[Aronis]

Shows on dash display and on the iDrive display.

You put more air in....go to the Car Settings, find Tire Pressure, hit reset.

[Pyrat 2]

Rough rule of thumb is that the pressure drops 1 psi for every 10 F. So if you were truly at 29 then your pressures were probably a bit low to start with unless the temp where you are at has dropped 60+ degrees F.

[terrywang]

Originally Posted by M3 Adjuster

When you reset the system then you simply reset it to a lower value.

The alert occurs when there is a delta below the pre-set psi.

In other words. If the set tire pressure is 35 psi then the alert would come on after dropping more than 5 psi.

When you reset the tire pressure norm to 29 psi then the pressures would need to drop another 5 psi below the set level of 29psi down to 24 psi or lower for there to be an alert for low pressure.

So, while resetting the pressure got rid of the alert temporarily , you would want to add pressure soon ( as you did ) and then reset the system again so that you don't damage your tires while driving with them underinflated.

It's nice when a car gives an alert for low psi but sucks that it also puts you into the comfort mode " penalty box " as well.

The AU spec (not pure version - pre LCI) got the advanced version of TPMS by default.

In the specification guide it says: Tyre pressure monitor, electric monitoring system, dispalys each tyre pressure/temperature and warns of loss at 3 stages.

[KevM2]

Can the tire pressure display somehow be activated on Canadian cars? Frustrating we don't have that

[tux2005]

Originally Posted by KevM2

Can the tire pressure display somehow be activated on Canadian cars? Frustrating we don't have that

M2Cs have TPMS but at the very least 2016-2017 M2s do not have TPMS in Canada. If you have metal valve stems then you likely have TPMS and if it doesn't appear then it may be possible to code, if you're on rubber stems then you're out of luck, and unless you buy TPMS to retrofit and code it, you won't be able to get it.