2012 Prius Spark Plugs Replacement

Denso (4711) IXEH20TT Iridium TT Spark Plug

 

This is from the Owner's Manual, page 566:



If you don't have Owner's Manual, you can download pdf format from Toyota TechInfo. Just google that phrase, it'll one of the first few links. Pick the "manuals" tab, fill in your vehicle's details, and search.

If you're using anti-seize (sparingly) on the threads, I would go with 13 foot/pounds torque. Dry threads: 15 ft/lb.

There's a singnificant amount of disassembly needed to get to the plugs. Have a look at @NutzAboutBolts video on spark plug changing, here (pinned at top of 3rd gen maintenance sub-forum):

DIY Auto Projects (formerly Nutz About Bolts) Prius Maintenance Videos | PriusChat

(note, he says 20 ft/lb, I think that's too much, especially with anti-seize applied)

You'll need a 9/16" spark plug socket, btw.

I'll attach some info from the Repair Manual. There's another bit, outlining basically the parts removal in the above linked video, but I haven't separated it out yet, and the video is clearer anyway.

 

Denso TT is a new and improved version of the original plug design.

DENSO IRIDIUM TT

Here's the Toyota Spark Plug application chart:
http://www.toyota.com/toyota-owners-theme/pdf/09_SparkPlugs2015_final[1].pdf

I replaced the original plugs in my 2011 Prius with NGK laser iridiums and have no problems with them. I noticed no difference at all, yet, between the NGKs and original Denso. Therefore, I cannot say how much or if the new TT design from Denso improves performance. If others say they are good, and you are going to stick with Denso, I would go with the TTs.

 

NGK and Denso often have near-identical offerings. Our Civic Hybrid had 2 plugs per cylinder, and (maybe just for equal billing) used one of each.

 

congrats and welcome! how many miles on her? i understand want to cover all potential maintenance, but plugs aren't due until 120k. how many miles on her?

 

air and cabin filters, check/clean/replace.

worth checking the brakes.

pcv?

 

nothing actually, if everything is working right. sometimes they get clogged.

 

Inverter coolant, clean battery fan vent, and clean fuel injectors to name a few others.


2016 Prius 4T Premium Convenience Pkg
2016 NX200t F Sport

 

Yes same coolant but separate systems.


2016 Prius 4T Premium Convenience Pkg
2016 NX200t F Sport

 

@hailmbrian there's a good video regarding brake bleed. Same place. Must watch. I'll post some info later.

 

Without techstream software you need to put the car in "invalid mode" via a chicken dance involving brake pedal and shift positions. Then you can bleed per conventional car. Watch @NutzAboutBolts video (same place), and I'll post repair Manual info later.

Fwiw I used syringe with thin tube extension (to baste fluid out of reservoir), tubing with bleed valve grommet at end, mayo jar with hole in lid, 8 and 10 mm wrench, and 2 pints Toyota dot 3.

And some help from my wife, pushing brake pedal, per video.

 

when you're in the brakes, lubricate the caliper slide pins.

 

More info for brake bleed:

Invalid Mode procedure, for brake bleed without techstream):

set parking brake
without foot on brake, press start button twice
foot on brake, shift to Neutral
press brake 8 times in 5 seconds
push park button
press brake 8 times in 5 seconds
foot on brake, shift to Neutral
press brake 8 times in 5 seconds
push park button
(car should exhibit blinking brake symbol, indicating in "invalid mode", for brake bleeding without techstream)

Bleed sequence:

Front Right
Front Left
Rear Left
Rear Right

Note, watch the nutzaboutbolts video, to get a feel for bleeding front vs rear. Front brakes you have to be very careful, bleed in short spurts. The rears, assistant can just press-and-hold the brake pedal, pump activates, and pumps out lots of fluid.

Make note of where fluid is in reservoir at the outset, and aim to end up at same level. Leave yourself a bit of fluid in reserve, for recheck a day or two later.

Some brake info from Repair Manual attached: