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How many oxygen sensor on a 02 chevy blazer - 2002 Chevrolet Blazer

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Hi, there are 4 sensors on your truck--two upstream and 2 downstream. The upstream sensors are mounted in the exhaust manifolds and the downstream sensors are mounted just behind the catalytic converters. The upstream and downstream sensors are different. Bank 1 is on the driver's side and bank 2 is on the passenger's side. Please let me know if you have more questions, and thanks for using FixYa.

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Posted on Jan 01, 2011

  • GambitM66 Apr 13, 2011

    No, there are only 3 oxygen sensors on a 2002 Blazer V6. 1 one the drivers side just below the exhaust mainfold on the exhaust pipe. And 1 on the passenger side exhuast pipe just before the Y connection of both left and right pipes. And 1 after the catalytic converter.

    I had a check engine light on for about 2 years, After one year, I had it checked at advanced AP, It showed bank 2 position 1. They told me I have 4 Oxygen sensors, and that Bank 2 position 1 should be the one in front of the catalytic converter. Well one thing is, still did not replace it, and yes gas economy went down a bit, but no rough idle yet. (When your sensor goes out, the computer goes into a looping mode to run your vehicle. But does not get feed back to improve performance.) Anyway, Yesterday decided get a scan again at Advanced, still the same Oxygen sensor was at fault. I looked and looked and never found a forth O2 sensor. Looked in the haynes manual, and it clarified that there were only 3 o2 sensors.

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Posted on Jan 02, 2017

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