Use the complete Mercedes specification
Provide registration, model year, engine and transmission. The same badge can cover different generations and controllers. State petrol, diesel or hybrid explicitly and include diagnostic identification if it is already available.
Describe the intended result
For diesel work, explain the response, load and torque delivery you want. For petrol work, state regular fuel and hardware. A modified or hybrid application needs its own brief rather than a borrowed figure from a different engine.
Check faults before performance work
Include servicing, warning messages and scans, especially if the vehicle has changed behaviour recently. Emissions, boost, fuelling or transmission faults can need diagnosis before calibration is appropriate.
Keep protected access application-specific
Supported access depends on the controller, hardware, software and required operation. The team confirms the route rather than promising one method for every Mercedes ECU. Calibration support and replacement-data support remain separate checks.
Ask about engine and gearbox scope
Include current ECU/TCU software and transmission symptoms. Automatic tuning is assessed for the exact application. The quote explains supported work, checks, required access and postcode-based arrangements.