Just got a 200k mile Prius. What can I do to ensure reliability and longevity?

congrats and welcome!
keep an eye on the oil level, many g2's burn a lot and low oil isn't alarmed until the engine blows.
air and cabin filters, tyres pressure, 12 volt health, all fluids, do you know any maintenance history?

 

In my experience the first warning is check engine light flickering (w/misfire error code) at 2 quarts down or red triangle on hard braking...

 

Well I hope you got it for reasonable because it 200k it's pretty much used up you got about 100K to go and you might be able to make that without having to do the brake actuator stuff like that if you're really lucky and by that time 300k everything should be changed and you'll be in something else but on the other hand if it's in real good shape and you take good care of it should go to 600k

 

Preventative? Maybe better to make sure all maintenance items are looked after. Get a proper code reader for specific Prius codes such as the Autel AP200. Your inverter pump may last another 50K, why chance replacing it, the replacement might have a shorter life, better to monitor the inverter coolant reservoir, watch to see if the coolant is in motion. Be vigilant regards engine oil level.

 

you might get dr prius app for a battery health check. grid charger to recondition the battery, or just save the money for a new battery if/when needed.

 

the only one i've read about is prolong from hybrid automotive. there are quite a few threads here.

 

After you clean it, Toyota now makes an OEM gen2 battery cooling fan filter screen that snaps on easily in the cabin. Won’t trap the smallest stuff but it does keep larger crap out like pet hair. Available online or at dealers.

 

DiY Grid Charger | PriusChat

 

If I remember right, it's much more likely to just be a dirty MAF sensor. Costs about $10 for a can of MAF spray cleaner, a Q-tip or two and about 30 minutes of your time.

Read this thread. I learned a lesson in it.

P0171 System Too Lean (Bank 1) | PriusChat

 

For the P0171, pretty much the first thing I would do on an older Toyota is to carefully clean the MAF sensor (and the throttle body bore while you're there). Then clear the ECM codes and drive it while watching short term and long term fuel trim (ideally ST + LT together should be near 0%, but I can live with up to +/-10%).

Use spray MAF cleaner (or brake clean) but the sensing elements on the MAF are delicate. Use cleaner on a rag and an old toothbrush to scrub the side of the throttle body bore where the throttle blade is (when the blade is closed).

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That’s a good question. My IR is creeping up and I still get good mpg on my original battery but I’ve often wondered if leaving well enough alone is a good strategy or if reconditioning would get me something.
I’ve never seen or maybe I missed it, specific advice on when reconditioning should be done. Then there’s the issue of causing more harm if something goes awry.
What are the specific criteria?

 

The only thing you can really mess up on these cars is the oil level. In the winter a 200k+ will lose quarts and quarts of oil. If you're far up north, you may have to add a quart every 500 miles or so. There is nothing you can do. But with the gas savings it's still very economical.

EDIT: Get Techstream too, along with the special obd. ~40 dollars and worth it's weight in gold, literally.