Ride level deviation fault

[Madwelshman]

Hi Guys
Well I sorted one issue out by replacing the solenoid unit under the car, thanks to those who gave me advice to where it was located.

I also have a ride level deviation issue, I understand the deviation is in relation to the recommended height setting and I have the rear axle at 0 on both wheels. I have managed to get the front right to 0 but the front left throws up some weird figures like -1954 which brings up a fault. I managed to adjust the height and got it to -4 but after a run it went to -10. That is still ok so not touching it at the moment

Question
Does anyone know why I would get a large negative figure and what may cause it?
I have replaced the level sensors on both front wheels and the regulating rod on one. Could it be the regulating rod on that wheel that could be stiff ?

Thanks