<<Just figured out why the black key worked!!
It was on the same set of keys as the transponder key, the engine starts reading the transponder key not in use! does it make sense?>>
Yes it makes sense. You should also know that if you use that MOBILE FAST PASS or whatever it is called, it can affect it also. If it is on the same key chain and next to the ignition, sometimes your car may not start. You know what it is, that FOB that you wave at the gas pump so you don't have to use a credit card.