Hi I'm Anita. My srs light comes on when someone sits in the passenger seat of my 98 C230. Is this a sensor. Can I replace this myself. Please help

 

probably need a new weight sensor in the seat. no not something you would want to do yourself. dealer might charge 5 hours to replace it. part estimate 200.us dollars. if that person is using the seatbelt...could need a new belt buckle.