Audi allroad air suspension

[A. Hawkins]

I have an Audi alroad having issues with the Air suspension.  Rear air bags were replaced last year.   Fault light kept appearing once a week then go off. For a week or 2. 

Anyway fault light and speed restriction appeared, suspention would not go up or down. Put in to garage, they says it looks struts! Have advised us Specific Audi struts are very expensive but cheaper ones may not last,  so putting it out there to you all.  Any advice on where to get decent struts.  Make ? Links? 

Thank you all. Alice. 

[ThomasG]

Have you scanned it and made sure it's not just a sensor?