This tool is pretty neat - I'll buy it just because its so easy, A freind of mine made me a similar item but its a simple LED and a circuit that inductively fires it - Need a bit of darkness to see it.

If the induction coil is not working, the key wont spit the code to the ignition.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)