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I think that one of the navigation set up options is 'calibrate' ? This allows you to check that the navigation system has recognised the cars current location. It uses the current location as a reference point for guidance so if the cars position is incorrect on screen, the instructions given by the guidance system will also be incorrect. It is also worth checking that the route options are set to your preferences, if 'avoid major roads' is active you end up on a magical mystery tour !

Mate don't know if it would be the same mine done it when I bought it I got it home put run a scan obd and came up a that a engine knock sensor my car is xj8 3.2 v8 2001 not sure if that could men anything to ya mine miraculously cleared delete code 247 still pops up no limp my model suffers bad with the corrosion