What the calibration does
A Stage 1 calibration changes how the engine ECU manages the engine on a suitable vehicle. The aim may be smoother response or stronger torque delivery, depending on the engine and its intended use.
Why a check comes first
A running fault or transmission issue can make remapping inappropriate. Share warning lights, recent repairs and service history so the technician can identify checks before discussing software changes.
Insurance, warranty and use
Contact your insurer before a modification and check your warranty terms and applicable requirements. Tell the technician how you use the car. Repeated towing and everyday driving can call for different considerations.