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Q: Lean fuel mixture on 2006 Nissan Frontier

I was told by Auto Parts that the pinging was due to a lean fuel mixture, so what do I need to do to fix it?
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I think the diagnosis may be jumping to conclusions. Pinging can be caused by poor or low octane gas, carbon build up in the cylinders, a malfunctioning EGR system an air flow meter that is failing and not telling the computer the correct amount of air entering the engine, a vacuum leak or inadequate fuel pressure/delivery. Freeze frame information on a good scan tool will show fuel trim figures long and short term on both banks and will be a key figure in diagnosing what is wrong.
I didn't have this pinging until I went hunting and drove through a very deep mud hole, in low for wheel drive and first gear. After doing that which was on Friday the 8th of Oct it is still pinging. So what is next?

Thank you!!!
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