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Oxygen or O2 sensors are usually located on the exhaust system of the vehicle. The first will be BEFORE the catalytic converter and the second will be AFTER the catalytic converter, (Total of 2). For engines that are V6, V8 etc, this applies to both sides of the engine as two exhausts are fitted. (Total of 4, 2 each side).
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.
if you have the V8 gas engine, the cylinders on the passenger side from front to back are #1 #2 #3 #4 the cylinders on the driver side are from front to back #5 #6 #7 #8. if you have a V6 gas engine the cylinder placement is passenger side from front to back #1 #3 #5 the cylinders on the drivers side are from front to back #2 #4 #6. if you have a diesel V8 engine the cylinder placement is passenger side from front to back #1 #3 #5 #7 drivers side from front to back #2 #4 #6 #8 and last but not least if you have the V10 the cylinder placement is passenger side from front to back #1 #2 #3 #4 #5 and driver side from front to back #6 #7 #8 #9 #10.
Hello! You didn't specify which engine that you had, so I will supply you with both V6 (3.4) and V8 (5.7).
V6: 1-2-3-4-5-6
driver's side: 2-4-6 (2 is at the front)
passenger side: 1-3-5 (1 is at the front)
V8: 1-8-4-3-6-5-7-2
driver's side: 1-3-5-7 (1 is at the front)
passenger side: 2-4-6-8 (2 is at the front)
How to Find the Cylinder Order V6
When standing in the front of the vehicle the cylinders are numbered 1-3 up the passenger's side and 4-6 up the driver's side.
How to Find the Cylinder Order V8
When standing in the front of the vehicle the cylinders are numbered 1-4 up the passenger's side and 5-8 up the driver's side.
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