maintenance intervals for fuel filter, battery

Props for reading your manual!

Fuel filter is inside the gas tank with no maintenance required. Barring major extra contamination it should last a couple hundred thousand miles plus. This is common on newer cars.

The battery is sealed, no maintenance required. Also fairly common.

Per Toyota, the fluid in the transmission is lifetime fluid, but there is good info including used oil analysis here on Prius chat indication that isn't wise. Recommendations here for how often it should be changed vary, but 1st change at 30k miles, then change it each 60k miles is fairly common. The reason for the earlier change for the 1st change is to get rid of manufacturing contamination and higher wear from new parts breaking in. Some do the 1st change earlier.

 

There is NO fuel filter.

The battery needs NO maintenance.

They don't recommend changing the transaxle fluid for at least about 100k miles. I would prefer 25k miles.

 

There is one. The fuel filter is inside the fuel tank.

Edit: I thought you could get one, but it looks like a non replaceable part. You would need to by whatever subassembly it is part of to replace it.

Another edit: Took a look in the Factory Repair Manual. It tells how to remove the pump and filter and remove the filter, but that doesn't do a lot of good if Toyota doesn't sell the filter separately.

 

Mine cost $109 to get changed, if you have jack stands you could do it yourself for about 1/3 of that.
You want 4 quarts of ATF WS and 2 washers for the drain and fill plugs, all at your Toyota parts counter.

 

The Prius 12V battery is smaller than a normal car battery since it does not have to start the engine. The HV battery does this with MG1. The typical life of this battery has been in the 3-5 year range.

If the 12V battery voltage drops below 12.0V it can cause a lot of weird problems including alarms and diagnostic codes. You will want to test the 12V battery voltage on a regular basis to prevent this from happening. Search on here for 12V battery testing and weird things happening as a result.

 

Do not add water. Here is what can happen:
Battery acid is eating exhaust shield | PriusChat

I know of people who believe in maintaining things that do not need to be maintained, sometimes it does more harm than good!