Dashboard Tire Pressure Indicator vs. Tire Pressure Gauge
Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
Likes: 163
From: Orlando, FL
2016 E400 Coupe (C207)
Dashboard Tire Pressure Indicator vs. Tire Pressure Gauge
Which is more accurate, the tire pressure indicator in the instrument cluster, or an inline tire pressure gauge? Mine disagree and I'm wondering which I should trust.
Super Member
Joined: Apr 2016
Posts: 889
Likes: 148
From: Southern Illinois
, 2023 BMW X4, 1991 190E
Tire pressure gauges
I have noticed the same thing too but normally only 1 or 2 lbs difference. If you drop your tire gauge, it could damage it and cause a faulty reading. Buy another tire gauge and get a quality one and see how it compares. Alot of people just use the cheap plastic tube type, I would invest in a metal tube type or one with the round dial. Good luck.
Thread Starter
Super Member
Joined: Sep 2017
Posts: 738
Likes: 163
From: Orlando, FL
2016 E400 Coupe (C207)
I have noticed the same thing too but normally only 1 or 2 lbs difference. If you drop your tire gauge, it could damage it and cause a faulty reading. Buy another tire gauge and get a quality one and see how it compares. Alot of people just use the cheap plastic tube type, I would invest in a metal tube type or one with the round dial. Good luck.
Newbie
Joined: Jun 2019
Posts: 4
Likes: 0
2019 E450
I think I didn't make myself clear.
The sticker says 33 psi.
The low pressure warning on the display says a tire that is 40 psi is OK, and that a tire that is 37 psi is low!
I used a gauge to measure the tire pressure and the tires are close to the pressures displayed on the warning screen.
D.
The sticker says 33 psi.
The low pressure warning on the display says a tire that is 40 psi is OK, and that a tire that is 37 psi is low!
I used a gauge to measure the tire pressure and the tires are close to the pressures displayed on the warning screen.
D.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 377
From: San Jose area
'19 E63S sedan
I think I didn't make myself clear.
The sticker says 33 psi.
The low pressure warning on the display says a tire that is 40 psi is OK, and that a tire that is 37 psi is low!
I used a gauge to measure the tire pressure and the tires are close to the pressures displayed on the warning screen.
D.
The sticker says 33 psi.
The low pressure warning on the display says a tire that is 40 psi is OK, and that a tire that is 37 psi is low!
I used a gauge to measure the tire pressure and the tires are close to the pressures displayed on the warning screen.
D.
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Super Member
Joined: Apr 2016
Posts: 889
Likes: 148
From: Southern Illinois
, 2023 BMW X4, 1991 190E
There is a way to reset the values ie adjust the desired airpressue you want to maintain in the tire. If you wanted to you could make them all 39 PSI and it would be the base setting. I just google this and found out how to do it.
Newbie
Joined: Jun 2019
Posts: 4
Likes: 0
2019 E450
I think I have it figured out...
It has nothing to do with an imbalance in pressures or anything like that.
The car simply records the tire pressures when you reset the system. When the pressure is 3 psi below the pressure you told the system is "normal", the warning pops up.
The driver side door jamb sticker says 42 psi, I believe this is the maximum pressure. Whoever checked the tires (at the dealership!) must have though that was the normal pressure, filled the tires to 42 psi, and reset the system. That is why a 40 psi tire was OK and a 39 psi one was not.
I let some air out of the tires until they were all 33.5 psi and reset the system. All is well.
D.
It has nothing to do with an imbalance in pressures or anything like that.
The car simply records the tire pressures when you reset the system. When the pressure is 3 psi below the pressure you told the system is "normal", the warning pops up.
The driver side door jamb sticker says 42 psi, I believe this is the maximum pressure. Whoever checked the tires (at the dealership!) must have though that was the normal pressure, filled the tires to 42 psi, and reset the system. That is why a 40 psi tire was OK and a 39 psi one was not.
I let some air out of the tires until they were all 33.5 psi and reset the system. All is well.
D.
