Question about 1997 Chevrolet Lumina
I suspect you are talking about the O2 sensor heated circuit
in order to make the vehicle run as efficient as possible, the O2 sensors need to be HOT
while the exhaust is hot, it still does not get the O2 sensors hot fast enough
therefore they heat them on start up with the heater circuit
Posted on May 13, 2010
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Posted on Jan 02, 2017
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