How to Check E36 Engine Codes Using a Paper Clip
1Turn your BMW off and get rid of the key from the ignition.
2Slide your hand beneath the steering wheel column to locate the diagnostic port. The surface from the column is slightly raised over the port.
3Pry the cover off the diagnostic port.
4Bend the paper-clip into the shape of a "U," and push the its edges into the diagnostic port.
5Watch the dash from the BMW. The "check engine" light ought to blink. Make a note of how many times it blinks before a pause. As an example Professional diagnositic tools, when the light shows a pattern of "Blink-Blink-Pause," "Blink-Pause Auto tools," "Blink-Blink-Blink-Pause" in addition to a final "Blink", the code is 2131.
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