Catalytic Convertor problems of the 2003 Mercedes Benz 240

Vehicle experienced brake problems, electrical issues, and catalytic converter. Vehicle was in an accident resulting in $7500. 00 dollars in damages. Mercedes wanted to give the owner a new vehicle but wanted $4000. 00 dollars in exchange because of time owned. There was a grinding noise upon braking, the vehicle would surged forward when stopping, the rear brake lamplight was defective, hesitation upon acceleration, the sun roof did not close and would not close properly, and there was a vibration when braking.