Question about 2003 Chevrolet Suburban 1500

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For the O2 sensors, is bank one on the driver or passenger side?

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Drivers side

Posted on Sep 06, 2009

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How many o2 sensors are on a 1999 Silverado 5.3


The 1999 5.3 V8 engine had 4 oxygen sensors. There are two catalytic converters on this engine, one on the driver side of the engine, and one on the passenger side of the engine. This is important to know, as the number of oxygen sensors is directly related to the number of catalytic converters on the vehicle. Driver side is referred to as Bank 1, passenger side is referred to as Bank 2. This is very important to know when looking up replacement oxygen sensors. There is one oxygen sensor in front of, or before the catalytic converter, usually referred to as a pre-catalyst O2 sensor. There is also one behind, or after the catalytic converter, usually referred to as a post-catalyst oxygen sensor. So, you have two oxygen sensors on Bank 1, and two oxygen sensors on Bank 2, for a grand total of 4 oxygen sensors.

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Need more information but here is where all your O2 sensors are located
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Bank 2 Sensor 2 - Passenger side, after catalytic converter

Thank you for using fixya and good luck

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bank 1 is the drivers side bank, so b1s1 would be the drivers side closest to the engine. if the truck is equipped with several 02 sensors then bank 2 or b2s1 would be passenger side closest to the engine. those are called upstream o2 sensors and the others downstream b1s2 and b1s2 b= bank 1= drivers side s=sensor 2=downstream. hope this helps.

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On a 2003 chevy s10 4.3 v6 which side is the bank one 02 sensor on?


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Also sensor one is before catalic converter and sensor two is after catalic converter.

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