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code 43 is most likely a problem in the fuel supply system.
Check the following..
check the wiring on your o2 sensor's and make sure that they are not damaged. If they are, then replace the o2 sensor.
I would suggest for you to replace the o2 sensors anyways if you have not replaced them within 60k miles?
If the o2 sensors work out then you are done.
there is a chance the there is a problem in the fuel system and you will need to perform further testing. I suggest to go with this for now. If you happen to need our help again then please feel free to repost.
Please accept my answer. please remember that positive feedback is always appreciated.
Thank you again.
Code 43 isn't most likely a fuel supply problem but it IS a fuel supply problem. That's the definition of the code.
I wouldn't start replacing expensive parts until you verify they are bad. Simply checking the wiring of the o2 sensor then suggesting replacement isn't the proper way to diagnose it.
Here's the factory manual scan so you can properly diagnose the problem without guessing and changing parts that are not needed.
91 is the same as 92 for the flowchart. Let me know if you need anything else.