So some interesting news
if you calibrate a fuel strip and it fails you'll get the fuel strip error code that clears, and the miles and fuel display count down, making you think OK, it just didn't achieve anything.... But then it does nothing at all when you fill it up. Reacting as if you've put nothing in, so orange light and fuel message on the cluster remain, and the distance to empty counts down and at Zero the display reads "- -" and stays there with No error messages stored in the ECU - So BMW deliberately mess it up to get you back to the dealership - software that wasn't written by crooks would just leave the old values stored
So got the repaired strip out the cupboard (piezo igniter trick 19 times) and 4 paper clips, gave myself a 10% chance and 4 mins later "fuel strip calibration successful" - connected things up, did 20 yards and get a full tank of fuel
if you calibrate a fuel strip and it fails you'll get the fuel strip error code that clears, and the miles and fuel display count down, making you think OK, it just didn't achieve anything.... But then it does nothing at all when you fill it up. Reacting as if you've put nothing in, so orange light and fuel message on the cluster remain, and the distance to empty counts down and at Zero the display reads "- -" and stays there with No error messages stored in the ECU - So BMW deliberately mess it up to get you back to the dealership - software that wasn't written by crooks would just leave the old values stored
So got the repaired strip out the cupboard (piezo igniter trick 19 times) and 4 paper clips, gave myself a 10% chance and 4 mins later "fuel strip calibration successful" - connected things up, did 20 yards and get a full tank of fuel