Mazda Repair Questions? Ask Mechanics for Answers ASAP
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The most common cause for this issue here is a fault with the remote itself.It may test o.k. and send out signals but they may be weak signals due to an internal fault with the remote needing replaced.I have run across this several times before in the past and had to replace the fob.I would have the fault codes checked to see what codes are set using a scan tool that will plug in and communicate with all computers.Any codes set need diagnosed to locate and repair this issue here.The remote can usually be tested properly by a dealer to see if for sure it needs replaced.
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Set means any codes that are logged or stored by the computer/scan tool.You want to have these checked using a scan tool plugged into your vehicle that can communicate with all computers in your model as some scan tools are only designed to read engine codes.