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In my 1989 Samurai there is a switch under the drivers side dash with a red,white and blue wire that connects to the instrument gauges. What is it for,does anyone know?:confused:
 

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I was told that it is used to turn off the check engine light when it "reminds" you that the EGR valve is due for service, approx every 60k mi.
 

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canada its a check enine switch. US it's just a service reminder reset. You flip it when the engine light comes on every 60K miles. Reminds you to do the timing belt, o2 sensor, and other long term scheduled maintenance.
 
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