I replaced my factory wheels and tires with new aftermarket ones. The price the seller quoted for new Mercedes TPMS sensors was expenses so I asked for an alternative. He had Mercedes 315Mhz TPMS sensors that he had removed from another SL550 and he offered them I agreed. The new tires and wheels are on but I can not get the TPMS sensoprs to hook up with the car. The error message is "Tire pressure monitor inoperative. No wheel sensors". I had a flat on one of the tires so I checked the TPMS when the tire was replaced and it is indeed a Mercedes unit at 315Mhz.

Does anyone know what I need to do to sync the sensors with the car? I looked in the owners manual but the instructions don't apply with the error message I get. Any suggestions?

 

Usually TPMS sensors need to be reprogrammed so your ECU knows it's there.

 

Im having an issue getting my new sensors to read and hook up to the car. Getting error message that says I have none. Just put new wheels on, that have MB sensors in them. Anybody know how to resolve this issue. Drove the car for a bit hoping it would recognize them but no luck.

 

You're in the wrong forum - you have an R231. Go here:

https://mbworld.org/forums/sl-class-r231-159/