P0A80 code twice in 10 days/200 mi

For $10 or so, yeah.

Oh hang on, you've got it, but partially locked? Are you able to do the bar graph display of the blocks?

 

Not before but definitely after, is to clean the entire egr circuit. It will take half a day to do that not including an occ addition because Saving gas cost a lot of money.

 

if you are going to diy, it's always worthwhile to remove the battery and inspect everything for corrosion, and clean the cooling fan before replacing anything

 

Certainly seeing the voltages of individual modules is necessary if you are going full diy "whack a mole" used module replacement. After the third or fourth "repair" in the first year you will be quite good at it.

The most important thing to know is various suppliers sell "reconditioned", "refurbished", repainted or just plain used battery assemblies. There is no way to actually recondition or refurbish twelve year old batteries. Dorman is used but repainted. At least sellers selling batteries described as used are not blowing smoke at you. Even with guarantees (most of which are not honored well), all of these options will cost you anywhere from 50% to 100% of new battery modules.

So new modules from Toyota, third party new Toyota resellers, newpriusbatteries.com or projectlithium.com are the best bet. New will give you eight to twelve years of service. Used might last a year.

Also understand the other big money issues on these models. Head gasket fails and Brake Booster failures can ruin your faith in humanity especially if you discover a coolant sealer was used or brake booster codes were cleared. Be sure those killers are not lurking in your new purchase.