Best Spark Plug Replacement for Gen4?

The screen grabs I posted up the page are from the US Owner's Manual lol.

Addendum: search the pdf version for "denso", is easiest way to find.

 

It's weird that napa site says it does not fit 2016 prius

 

bought them at ebay, order was showing clearly gen4 plugs, manual is showing old plugs p/n, going to do a full maintenance this weekend , lets see what will be the mpg, car already passed the 100k, hoping replacing those plugs wont require disassembly of all wiper mechanism like gen3, has anyone done that so far without that crawl bar mess?

 

Yesterday I did not see the owners manual images in your post. One would expect maintenance items be in the Maintenance Manual.

 

The plugs you have are the revised spec 3rd gen plug, slightly hotter. I would use the plug recommended in the 4th gen Owner's Manual. What you have "may" be compatible, but I would take the Owner's Manual recommendation, not eBay.

 

It has been 15 months since the last reply. Has anyone used any other spark plugs than the FC16HR-C9? I'm fixen to hit 240,000 and will be changing spark plugs for the second time. I replaced with the above plugs at 120,000 as recommended by Toyota. The OE plugs are $13 and up.

 

They work. You could try something else cheaper - and then if they don't work, you end up paying $13 as well. And - if they damage the ignition module or worse ...

 

Absolutely worthless reply. You have not added anything constructive at all.

 

Rock Auto lists the 2016-17 Prius Denso spark plug # 3517 and the 2015 Prius Denso spark plug # 4711 (TT) or # 3499 (LL).
I guess the gap and heat range have changed but we know these engines are nearly identical, the 2zr-fxe. Someone, at Toyota, must have thought there was something to be gained by the change. I think I might pull the plugs out of my old 2012 oil burner and put them in my 2017 engine. I need to change my plugs anyway and this would not cost anything to try. Don't worry, it won't "burn up any modules."
- Fix That Prius !!!