TPMS
Super Member
Joined: Jun 2017
Posts: 608
Likes: 107
From: Western NC
2009 MB C300 Sport 4matic
The pressure light may be on because you have 433Hz TPMS Mercedes senders, not the 315Hz Mitsu uses...some MB senders do use 315Hz. If the MB TPMS units are older than 7 years or so, their batteries may be dead also. No way to turn off the warning light, other than remove the bulb.or cover it with a spot of electrical tape.
