My TPMS went off today and I was wondering if someone could tell me the correct tire pressure I should be running on the front and rear tires?. I have a 2009 C230 4matic that came with 17" michelin pilot AS. Thanks

 

Open the driver door and read the sticker in the door jamb...proper inflation is shown there. Be sure to measure cold tires before driving.

 

One thing you might want to check is to make sure that the TPMS is set to the correct setting. Sometimes the dealerships like to over inflate the tires and set it as the "correct" setting. That's what happened to me.

 

If your tire pressure is off (low psi), check for nails/screw or tire damage. If nothing- have a tire shop check the valve stems. I had the tires placed on new rims and the shop didn't use a TPMS rebuild kit. The gaskets and other internal parts do wear and will need to be replaced. I replaced my rear tires and reminded them to use the kit and I have had no problems since.
Good Luck!

 

I just checked mine today sooo you're in luck since i just looked at the psi's on the label from our door jamb. I too have a 4matic so fronts are 30 psi while the rears are 35 psi. I also have the same tires.

 

My Bremen made C300 Sport has its label on the fuel door and calls for 28 front, 33 rear on the base 17s. I run 30/35.

 

C230? Are you in Canada? The monitoring system is based off rotations and they are not actual pressure sensors. But if it does go off, then something's definitely up. The sensors have gone off twice on me so far and both times there were screws.