How many O2 sensors for my car?

This engine has four oxygen sensors, two primary and two secondary sensors. Here are the locations and how to change them out. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Bank 1 is on the right side of the engine near the firewall. Check out the images (below). Please let us know if you need anything else to get the problem fixed.

Thanks, will attempt to get these changed. Appreciate it.

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