If your car has factory adaptive dampers, fitting lowering springs on their own will usually throw a suspension fault and leave the electronic damping control confused about ride height. Pro-Tronic is a small plug-in module that recalibrates the system so it keeps working properly once the car is lowered.
Only relevant if your car has factory adaptive dampers — check your spec or send us your registration/VIN and we'll confirm before you order. We fit this alongside your spring or coilover upgrade in the same session.
