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removing the negative battery terminal for 10 minutes and then putting it back on worked to reset mine ==New Answer== My 1991 Geo Tracker Lsi does not have the switch, located on the steering column bracket, which service manuals describe. Instead, it has a micro-switch which is attached to the back side of the speedometer. This switch is operated by a cam which is driven by the odometer mechanism. The switch is suppossed to turn the "Check Engine Light" on at 50K,80K,and 100K miles. This is to have you take the car back to the dealer for service of some kind - the owners manual does not state what service is required. I just disconnected the micro-switch so the light can be illuminated by the ECM whene the is an actual problem, not an interval. Theres a reset switch hidden by the drivers side speaker, you have to reset it every 2000 or 3000 miles, just flip it to the other side and next time flip it the other way.

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Q: How do you reset the check engine light on 1991 Geo Tracker?
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