Question about 1999 Chevrolet Blazer

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How many oxygen sensors are on a 1999 chevy blazer?i found 3 one on each manifold before the cat and one after the cat. but the guys at the local auto parts store said that there are 4 total. am i missing something? -also i have the famed p0420 code. but my air pump system was shot and i replaced it. could my o2 sensors have crapped out as well? the code reads efficiency below threshold in bank 1

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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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