Cleaning MAF -- need new O ring?

Unless it looks damaged I wouldn't worry about replacing it this time. Some might put products like Super Lube on when reinstalling to keep the O ring in good shape.

 

The Toyota repair manual does not require O-ring replacement as long as it is in good condition, as previously stated.

 

Your car is only 5 years old and presumably the MAF sensor has been undisturbed until now - so I would say there is a high probability the original O-ring can be reused.

 

I removed the MAF in our '04 Prius numerous times over the years. Now that I remember that it has an O-ring, I can say that it always looked to be in fine shape.

CP: If your car's MAF O-ring does look ratty, don't sweat it. Just buy the part when you pass by a Toyota dealer and exchange it. You'll find out from the cleaning that putting in a new ring is trivial.

<soapbox>
I have been following the threads and posts of owners who have maintenance and simple repairs performed by dealerships, and overall it seems that dealership service(s) are five to 10 times the cost of DIY. So while you are somewhat stuck going to the dealer for the pump replacement this time, I encourage you to join the DIY band-wagon in the future. This forum has great tutorials (most often written by Pat Wong), and lots of help if needed. Youtube has great videos. The trick is to not wait until emergencies force your hand.
</soapbox>

 

Kris,
If you decide to start a support group for blind monkeys with wrenches, let me know. I'll be the first to join.
Seriously, it would be hard to find someone less mechanically inclined than me, and I had never tried to do anything on any car I owned until I bought a Prius.

What changed me ? Interest in the Prius, this fantastic forum, and watching lots of YouTube videos.
Sounds like we have traveled much of the same path: first simple maintenance, then more involved things in small steps.
By the way, Hobbit's Prius website is just unbelievably fantastic, and the Bentley book on the Prius is money VERY well spent.

A not small part of replacing a wear part in a Prius is just getting to it. The first time can be a bit of a bear; the second time isn't so bad, and thereafter it is easy. So I have also been known to just disassemble small parts of the Prius just to gain confidence and learn about the part(s) involved -- before actual work is required. I have also found that buying parts that I know will eventually require replacement way ahead of time is a good idea. Not only does it let me pick when I want to work on the car, I have ample time to fiddle with a clean part and gain a degree of familiarity.

There is a Zen about new cars in general, and Prius most of all, that is helpful to grasp: cars are engineered these days so that with good maintenance of filters and fluids, cleaning/lubrication of a few areas , and timely replacement of wear parts by design, unexpected and costly repairs are rare. Neither of us will ever understand our cars very well, but we are all capable of keeping our cars happily running for a decade or two and for the most part, out of the clutches of expensive dealerships.

Cost? Maintenance+repairs, about a penny a mile for the first decade, I guess 2 - 3 cents/mile for the second decade. Tyres are extra

 

Kris, I'm copying a post of mine from another thread you might find useful.
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I set the car on 4 jacks so that I can rotate tyres while the oil is draining.
The car really does lend itself to multiple maintenance items at one time; it just takes a little planning

I work on my car once a year (10k miles), and perform the following 4 of every 5 years:

1. Cabin and Engine filter checks, replacement if needed
2. Oil exchange, oil filter exchange
3. Tyres rotated
4. One gallon (partial) Engine coolant exchange
5. CV boot cleaning and spray with silicone

Every 5th year, the above is done and in addition

• Brake pins are lubed, pads and rotors are checked
• Inverter coolant exchanged
• ATF
• Brake fluid check for pH, water and copper; dealer flush if required
• MAF and throttle plate/body cleaning

At 10 years, the above is performed and in addition

• Spark plugs
• PCV
• Serpentine belt
• Engine pump
• Front struts if needed, or if I am in the mood

-------------
So nine years out of ten, maintenance amounts to a couple of hours one time a year. Year ten takes all day because of my unfamiliarity with struts.

I forgot to mention, the free to you but very important to the car monthly routine:

• Check engine oil level
• Check brake, steering, and coolant levels
• Adjust tyre pressures

 

I don't recommend anyone messing with brakes and struts unless you are very familiar with what you are doing. You risk serious injury or maybe death if it's done wrong.

 

That is how I feel about the inside of the traction battery, but I've pretty much decided to install a new pack myself if the time comes.

YMMV. Almost everybody can DIY the yearly and 5th year maintenance; 10th year stuff varies by owner.