Two of the codes indicate faulty catalytic converters and two indicate a lean fuel mixture. So, at this point, I would not replace the sensors without performing some checks.
The most common cause of a lean fuel mixture is an engine vacuum leak. Let's first check if there are any.
Here is a link that explains how to check:
Next, low fuel pressure can cause a lean fuel mixture. You should also check fuel pressure to see if there are no vacuum leaks.
Here is a link that explains how that is done:
You will need a fuel pressure gauge, but most parts stores will lend one to you. Also, I attached the manufacturer's fuel pressure specifications below.
Let me know if you are comfortable performing these tests. Also, let me know if the vehicle has a smooth idle.
See pic below.
Image (Click to make bigger)
Friday, November 3rd, 2023 AT 9:28 PM