C-Class (W206) 2021 to

My car went crazy about tires pressure.

Old Aug 12, 2025 | 02:05 PM
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My car went crazy about tires pressure.

Hello everyone,
Below is what I see from yesterday. Somehow my car doesn't want to take normal pressure as normal anymore and wants me to inflate them.

I'm puzzled. I guess I need to have a trip to the dialership to recalibrate or so. I guess the thing that it doesn't show it as psi means something.

The app shows psi but report it as incorrect also.


Last edited by Serg675; Aug 12, 2025 at 02:10 PM.
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Old Aug 12, 2025 | 02:24 PM
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No trip to the dealership required. Let the tires cool down, then use a tire gauge and make sure all tires have the proper cold pressure according to your load, speed and tire combination per the sticker inside of the fuel door. Then go into the Service menu in the instrument cluster, then to tires and reset TPMS. This will store the current tire pressures as the reference values. If you've never done this, then you don't know what reference values are currently stored. Most dealerships inflate the tires to the max load pressure on the door sticker and then set that in TPMS, so if you lower it to normal load, then you have to store those yourself. TPMS doesn't automatically know what the correct tire pressures are. You have to tell it.

https://www.mbusa.com/en/owners/manu...itoring-system

Last edited by superswiss; Aug 12, 2025 at 02:25 PM.
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Old Aug 12, 2025 | 03:52 PM
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Originally Posted by superswiss
No trip to the dealership required. Let the tires cool down, then use a tire gauge and make sure all tires have the proper cold pressure according to your load, speed and tire combination per the sticker inside of the fuel door. Then go into the Service menu in the instrument cluster, then to tires and reset TPMS. This will store the current tire pressures as the reference values. If you've never done this, then you don't know what reference values are currently stored. Most dealerships inflate the tires to the max load pressure on the door sticker and then set that in TPMS, so if you lower it to normal load, then you have to store those yourself. TPMS doesn't automatically know what the correct tire pressures are. You have to tell it.

https://www.mbusa.com/en/owners/manu...itoring-system
I'll try it. Thank you for the tip. It may really save me a trip to dialership. The issue is that I have adjusted my tires pressure for summer to 37 psi cold as mentioned on the fuel filler door in May and it goes between 34 and 39 ish whole summer and it was no warning. But since yesterday it suddenly became an issue. Funny thing is that right rear tire with the same psi gives no indication of the wrong pressure. It tells me that something is fundumetally wrong here. I hope that reset will help.

Last edited by Serg675; Aug 12, 2025 at 04:05 PM.
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Old Aug 12, 2025 | 04:00 PM
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Originally Posted by Serg675
I'll try it. Thank you for the tip. It may really save me a trip to dialership. The issue is that I have adjusted my tires pressure for summer to 37 psi cold as mentioned on the fuel filler door in May and it goes between 34 and 39 ish whole summer and it was no warning. But since yesterday it suddenly became an issue. Funny thing is that left rear tire with the same psi gives no indication of the wrong pressure. It tells me that something is fundumetally wrong here. I hope that reset will help.
It's possible that it lost its settings. Unfortunately, software bugs are an increasing issue with cars these days. MBUX is still rather buggy.
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Old Aug 13, 2025 | 10:23 AM
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We had a heat wave here in SoCal earlier in the summer and my left rear tire threw up an overpressure alert. The pressures were dealer-set. I let a few pounds out and reset the system and it hasn't happened again. But I first had to look up on Google how to reset it, as after I let some air out the alert stayed on. We owners often need Google just to comprehend what the cars are telling us.
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Old Aug 13, 2025 | 10:49 AM
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I have let my car to cool down and inflated tires a little to have exactly 37 psi. Then I had reset sensors. So far so good. No warning.
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