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How Do I Check My Check Engine Codes On A 1994??

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My check engine light comes on when I drive over 40 mph... I checked with autozone and they said that they can't read the codes for me since it's the OBD I instead of OBD II. Does anybody know of a free way to check the codes? Thanks


1994, Mazda 626, Manual, 6 cylinder, LX

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