Red Triangle/Check Engine/Red Car w/ Exclamation point diagnosis...

I purchased my 2001 Prius used with 175k miles on it it currently has 185k. Today while driving I heard a loud beep followed by the Warning/Problem sign on my in-dash monitor followed by a red car symbol with exclamation as well as a Check Engine and Red Triangle. I took it down to AutoZone to get a scan on the code but after 3 tries the scanner retrieved no codes. We had Triple A come down to try to tow the car to a trusted mechanic and once he arrived, he turns the vehicle on and fidgets with a few things then says the lights are on due to low tire pressure in my rear passengers side tire. I highly doubt that is the case but he seems confident that once I replace the tire the lights will go away in 72 hours...I know the tires have been needing replacement for a while but has anyone ever gotten a check engine from having low tire pressure? also any suggestions as to what to do next or what to look out for? Need to know how worried I should be about possible repairs or if it really is just a lot of commotion for an easy fix. Car drives just fine, nothing out of the ordinary.. no lagging on start up and no strange noises from engine or anything. Please HELP! I love my Gen 1 Prius

 

I was shown a receipt for a recently replaced new hybrid battery or at least that is what was claimed upon purchase a few months ago, unsure about the inverter or the 12v battery but i will have the mechanic take a look at all of these things ty for the heads up!

 

Update: retrieved a code P3006 Fuel & Air Metering and Auxiliary Emission Controls

should i be concerned?
when searching p3006 i get issues with battery...