On the 1990 Geo Tracker, you need to pull off the 4 x 6 inch panel that is directly under the steering wheel. Then place your pointer finger on the bottom-middle of the hole that the panel was covering and move it forward all the way, then curl your finger and you should feel the toggle switch, just slide it sideways and the check engine light will go off.
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Tuesday, June 14th, 2011 AT 2:32 AM