Mazda Repair Questions? Ask Mechanics for Answers ASAP
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Since in some cases it will start and operate properly but in others it will not this does sound to be immobilizer related and sounds like one of the components in the theft system is failing/acting up intermittently and causing this fault here.
The first thing that needs done if this has not been done already is to have a scan tool connected to your model that will plug in and communicate with all computers.Once this is done any fault codes set need diagnosed to help locate and repair this issue here.I have seen the immobilizer itself that reads the key fail needing replaced as one of the more common causes.
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