C6 Allroad air strut replacement question

[MH10001]

Hello,
Looking for some help with a front strut replacement on a C6 allroad. Compressor has been serviced using Andy’s fine refurb kit! Rear airbags replaced a couple of years ago. Front left replaced 6 months ago. Finally got around to replacing the front right strut (had a slow leak but was still functional). After fitting new strut from eBay the car sat about 2cm lower at that corner at all levels. Took it for a test drive and it understeered badly when front right put under load, causing ABS to kick in. Removed the eBay strut and put the original back on and everything fine again. When we had the 2 next to each other on the bench there was no obvious difference in geometry. So I returned to the eBay seller who sent out a replacement...which has exactly the same problem. So my question is - is there a procedure to recalibrate the suspension after fitting a new strut that I’m missing? (Didn’t do anything specific for the other 3 corners and didn’t have any problems). Or is this a dodgy batch of struts? Anyone had similar problems?
Thanks in advance for any advice!

[Jose Teixeira]

Yes you have calibrate the height.
For A6 C6 Allroad it must be 388mm on the front and 380mm on the back. You have to measure first and put the value you measured in order to the system knows where to pick your reference.