Question about 1999 Chevrolet Blazer
If it has 2 cats then it has four sensors. i cat 3 sensors. i dought they all went bad. o2 sensor malfunction will not cause a cat efficiency belw threshold code. i would guess a baf cat on bank one.but if air pump was bad it might be poluted with carbon.try driving it hard for a bit. mabee it will clean up
Posted on May 30, 2010
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Posted on Jan 02, 2017
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