It starts with the on board diagnostics.
Vehicle check engine light diagnostic tool.
Older vehicles equipped with obd i systems located these connectors in all sorts of places including under the dashboard in the engine compartment and on or near a fuse block.
Before you turn the car around and drive straight to an auto mechanic you could try using a check engine light diagnostic tool and figure out the problem yourself first.
Once you have your hands on a check engine light code reader or a scan tool the first step in using it is to locate the diagnostic connector.
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