What a German car actually needs
- Manufacturer-level diagnostic software, not a generic OBD reader. Coding, adaptations and service resets need the real thing.
- Battery registration after a replacement, or the new battery is charged wrongly and dies early.
- Correct oil specification by approval number, not by viscosity alone.
- Guided fault-finding for a car that reports thirty codes from one failed module.
The question worth asking: Which diagnostic platform do you run, and have you coded a module on this model before?