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On my 93 Trooper there is a "switch" behind the instrument cluster that resets the O2 replacement reminder light. I have read that it reminds you every 90,000 km. I say "switch" because it is actually a screw that you remove from one hole and put in an adjacent hole. Both screw holes are labeled - "KSW" on my cluster. This is a separate dash light than the check engine light. You can not do this without removing the cluster. It might not be an O2 warning light. It comes on when the computer detects a problem with the emissions controls. It may be a bad O2 sensor or it may be many other things. Don't assume it means the O2 sensor is bad. You may be able to reset it by removing the + battery cable for a few minutes. If it comes back on after resetting it, then the problem was not a bad O2 sensor.

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Q: How exactly do you reset the O2 warning light on a 1992 Isuzu Trooper I know you need to do something behind the speedo but what and how?
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