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OK, there's been threads like this before,.. BUT, the usual conclusion is the system is really sensitive.
But I'm getting the message when all 4 tires are 33 psi. And I've driven this car in the past when a front tire was 4 psi off, and I didn't get that message then.
I set them all to 32 psi when cold a day ago, using an internally-dampened and calibrated Longacre racing tire gauge. One that reads to 60, so 32 is in the accurate half of the range.
I also use nitrogen. I keep an 80 lb tank in my garage.
A mile from the house this morning the pressures have all risen 1 psi to 33 on all 4 corners, and I get this message (sorry for the terrible focus, it focused on the steering wheel), but I promise you they all read 33.
2019 S560
Restarting the tire pressure monitoring system Requirements:
* The recommended tire pressure is correctly set for the respective operating condition on each of the four wheels (→ page 435). In other words correct your tire pressures first.
Restart the tire pressure monitoring system in the following situations:
* The tire pressure has changed.
* The wheels or tires have been changed or newly installed.
On-board computer /Service /Tires using LH steering wheel buttons to get to the menus - Find Service and select it then find Tires and select it then next step
# Swipe downwards on Touch Control on the left-hand side of the steering wheel.
The "Use Current Pressures as New Reference Values?" message is shown in the multifunction display.
# Press OK to confirm the restart.
The Run Flat Indicator Restarted message is shown in the multifunction display.
Current warning messages are deleted and the yellow warning lamp goes out.
After you have driven for a few minutes, the system checks whether the current tire pressures are within the specified range. The current tire pressures are then accepted as reference values and monitored.
Last edited by MBGuy2022; Aug 14, 2023 at 07:58 PM.
You just have to reset the TPMS to the current pressure as your "zero". So when you inflated the tires to your desired PSI, reset the TPMS. Only then when the tires are too far off from the set PSI will you get warnings.
Yeah we have a '17, (and a couple E550's with the same engine). The last year before they started neutering the engines, but the first year of the new 9-speed.
The tire pressures have never changed. I keep them at 32 year round, and we didn't recently do anything. The car must have just had a brain fart.
I'll try the reset with the tires cold in the morning.
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