Coetzee

How accurate are the tyre pressure monitor in the W205?
I've put the correct pressures in my tyres, 2.5 bar, and am using a ARB monitor which is correct, with my own compressor but within a hour of driving the readings were completely different on all 4 tyres, left 3.2 and right 2.85 and 2.95 respectively.
Who is right or wrong?

Pope_RW

I've found mine to be pretty accurate. Please remember.

As you drive, there's friction between the tires and the road. Friction means heat — and heat means an increase in tire pressure.

Coetzee

Yes, friction i know about but why not the same on every individual tyre?

Pope_RW

Not all tires heat up equally, each corner of the vehicle experiences different forces, acceleration, turn angle all contribute to different temperature at each tire.

whoover

The sun can have a surprising effect as well. Was the sun to your left during this drive?

Brittnie Jane

Since it has gotten hot here in Louisiana my tire pressure alert stays on, I don't think there's anything that can be done about it.

fbsdmd

Move to NY and all you'll need is the heater.