Dead battery

Asked by Nov 07, 2016 at 07:37 PM about the 2005 Mazda MX-5 Miata Base

Question type: Maintenance & Repair

Battery replaced and alternator checked
ok...picked up car...engine light on...won't test
cause not communicating...interior lights won't
work...keys don't unlock or not

3 Answers


You probably lost all the codes in the computer. You should have used a code saver! At this point you will need to take it to a dealer.


Yep that's right. Here's a pic of a cheap one. there are fancier ones that plug right into the OBD2 port and use a jump box or other 12 volt power supply.


Check for blown fuses I know the 05 ford f150 share fuse with OBD2 and aux cigarette lighter

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