Remapping or chip tuning your Mercedes involves downloading the memory chips in the Engine Control Unit (ECU) responsible for storing instructions about how your engine runs and changing the information stored there. This memory is known as "firmware," and it is the major element in the operation of all digital devices. Auto engines in the past used mechanical methods to make performance-enhancing adjustments, but modern vehicles utilize on-board electronic diagnostic procedures. During remapping, your Mercedes' diagnostics technology reads the data stored on the ECU chip and makes changes to improve the vehicle's performance. The data is accessed through the OBD/OBDII port. Remapping can be done on Mercedes models dating from 2000.
Chip tuning is a similar performance-improvement process designed for pre-2000 models. Both procedures can improve your Mercedes' engine performance significantly by enhancing torque and mpg. After chip tuning or remapping, you will notice that your vehicle has more power and a smoother ride. For pre-2000 Mercedes models, performance tune-ups are accomplished by chip tuning. This requires removing the ECU to access the memory chip and then reading the data stored on the chip and making changes that will improve vehicle performance.