When I test drove my C4s the pse seemed to be working fine. As soon as I picked up the car it wouldn't switch to quieter mode. The guys who look after my car then 'closed the valves' to make it much quieter. New valves have since been fitted but the difference between loud and quiet is now marginal and it stays loud even when pressing the switch. This is quite different to when I first tested the car.
Any ideas what could be stopping the PSE to operate properly?
Thanks
Any ideas what could be stopping the PSE to operate properly?
Thanks