Tight tolerance mode reduces the amount of height variation allowed before the system will attempt to re-level. Idea being as subtle changes are made to alignment the respective update is reflected in height as need be. It also, as stated previously, ensures the car is as level as possible throughout the alignment to get the best outcome. That does assume your levels are correctly set in the first place, IMO something that should be done as part of an alignment but I don’t believe ever is.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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