Chevy Impala Forums - View Single Post - '95 RMW Mirror Dimming Button,Brake Warning, and Spark Plugs
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post #4 of (permalink) Old 06-08-2015 Thread Starter
bocoogto
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Thanks! I'll change the plug wires at the same time as the plugs. They appear to be original also. Optispark is doing its job, though--never misses a beat and 23 mpg on the highway.

Why is there a light sensor on the front of the mirror? Does that option do anything besides dim the mirror?
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