Mercedes tire pressure changed from being 32 as the highest to 47 as the highest?

Question

I have a 2012 Mercedes e350 and the tire pressure used to be like 32 as the highest and I noticed that now it says the tire pressure is 47 and I never filled them up that high. So I was wondering why it changed that drastically.

Rex Schinner · Accepted Answer

I am now on my 6th MB.  Perhaps your pressure gauge is not working. Stop at a gas station and check your tire pressure, then you will know if the car’s gauge is working.

Rex Schinner · Answer

Are you saying the reading was 32 but it now states 47 PSI?  If so, sounds like you have a faulty TPMS unit.  Verify correct pressures with a tire pressure gauge.BTW, the correct tire pressures differ between front and rear.  Depending on if this is a E-sedan or E-coupe, and what size tires you have, but the recommended rear pressure can be as high as 46 PSI.  Consult your owner’s manual or the inside of the gas flap door for the correct pressure.

Rex Schinner · Answer

MAY BE A DEFECT of some kind! Are you using the TPMS as a guide here! use a real TIRE PRESSURE tester at each wheel to see if they are CORRECT!

Rex Schinner · Answer

Tire pressure is posted on the door frame and it is something at or less than.  Look at your tires.  Its says 40 pounds Max on them.  All tires are 40 pounds Max.  Have been for years.  Don’t know why you have this confused.  btw  The only time you use 40 pounds is when you have a ride to five of the biggest guys on the football team.

Rex Schinner · Answer

Steve H , I’ve been driving 40 years. In all the time all the cars I’ve had have had recommended pressure from 30-35 psi, mostly 32-34. Never heard of a car using 47psi unless it’s a space saver spare.

Rex Schinner · Answer

Set them with a tire gauge. You can’t trust the readings on your dash.

Rex Schinner · Answer

You are reading the maximum pressure the tire can safely handle listed on the sidewall of the tire. This is NOT the pressure recommended by Mercedes. The recommended pressure is listed on the driver’s door post or in the owner’s manual and does not change.

Rex Schinner · Answer

You bought different tires.  The max pressure on the tires is irrelevant.  Your tire pressure should be close to what’s recommended for your car which is usually posted in the driver’s door opening.

Mr. Bertha Ziemann IV

Mercedes tire pressure changed from being 32 as the highest to 47 as the highest?

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