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That is correct. There are a total of four. You have two upstream and two down stream. Each bank of the engine (there are two banks) has two sensors. I attached a picture showing locations.
Here is a link that shows how one is replaced:
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
Here are the directions specific to your vehicle. The first set of directions and pictures 2 and 3 show how to replace sensor 1 for both the front and rear banks.
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Special Tools Required
O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available
Front Bank (Bank 2)
1. Disconnect the front A/F sensor 6P connector (A), then remove the A/F sensor (B).
pic 2
2. Install the parts in the reverse order of removal.
Rear Bank (Bank 1)
1. Disconnect the rear A/F sensor 6P connector (A), then remove the rear A/F sensor (B).
pic 3
2. Install the parts in the reverse order of removal.
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Here are the directions for sensor 2. Each bank has one. These are the heated sensors. Pics 4 and 5 correlate with these directions.
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Secondary HO2S Replacement
Special Tools Required
O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available
Front Bank (Bank 2)
1. Disconnect the front secondary H02S 4P connector (A), then remove the front secondary HO2S (B).
pic 4
2. Install the parts in the reverse order of removal.
Rear Bank (Bank 1)
1. Disconnect the rear secondary HO2S4P connector (A), then remove the rear secondary HO2S (B).
pic 5
2. Install the parts in the reverse order of removal.
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Please keep in mind, it isn't normal for all of these to go bad at the same time. If you have a diagnostic trouble code indicating an issue with an O2 sensor, let me know what it is and I can direct you better.
I hope this helps. Let me know if you have other questions or need help.
Take care,
Joe
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Saturday, May 4th, 2019 AT 7:40 PM