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OBD1 (On-Board Diagnostics, version 1) does not use standardized diagnostic trouble codes (DTCs) like OBD2. Instead, each manufacturer has its own set of codes, often ranging from one- or two-digit numbers to alphanumeric codes. Commonly, OBD1 systems use a series of flashing lights on the check engine light or a specific diagnostic connector to communicate trouble codes. To retrieve codes, a scanner or a specific procedure (like turning the ignition on and off) is often required, depending on the vehicle make and model.

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2d ago

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