Which Spark Plugs?! Denso SC20HR11, SC16HR11, or IXEH20TT??

That does look bizarre.

 

Did you adjust the gap?

 

I know!
The problem is that I purchased them in May 2019! I guess to late to complain to the dealership and likely 45 bucks down the drain. I may question Denso directly, with the pictures if that is the quality they represent and approve. I am interested to learn if that's possible that Toyota dealer sold fakes or a bunch of leftovers from the service department.

How to Spot Fake DENSO Spark Plugs | Toyota Sienna Forum - siennachat.com

FAKE Spark plugs! Ebay | Toyota Sienna Forum - siennachat.com

How To Spot Fake Denso Iridium Power Spark Plugs 2017 - Driven 2 Automotive Blog

 

Were the plugs in Toyota or Denso boxes? If the latter, could just be dealership parts department buying bulk plugs and they got burnt with counterfeits?

 

Planning to do similar maintenance thanks to the wiper motor most likely not working. Planning to inspect when I have disassembled and was wondering if there is a cleaning that can be performed on the plugs? I'm guessing something very soft like brass at most or even softer like plastic brushing maybe or a best solvent spray, any suggestions from those with experience?

 

My original plugs were not fouled, and there's not a whole lot to the tips and electrodes, to be able to clean, unlike in past days when you'd soak and brush them.

You might consider getting 4 new plugs, and then inspecting one of yours. If you don't "like the look" of the OEM plug, then replace all 4. It's up to you, but removing the cowl is maybe 75% of the job of changing the plugs. And if you already took them out for cleaning, you may as well just replace them. (McGeorge Toyota is a good source for parts--find them online. Their current price is $8.94 per plug.)

 

Tooth brush and carb cleaner works for me. Put the plug end in a shot glass, give a good spritz, swish around a bit, go over with the brush.

 

Just an update regarding going to the Toyota Dealership to ask which plugs are recommended, at least here in Michigan, and I was told the
Denso SC20HR11 for the 2013 Prius 2

 

Perhaps they haven't kept up with the service bulletins from Toyota -- or maybe they have a stock of the old ones they want to unload.

 

Yeah Toyota's saying 16 instead of 20 now. That said, the 20's seem fine, I'm in no rush to prematurely swap out ours.

 

Hi guys,
I bought spark plugs to my rav4 2012 2.0L
The seller gave me denso sc16hr11 and he told me it is like sc20hr11 and they are not sell it any more.
My question is ok to use sc16hr11 plug?
Do Toyota approved this plug type instead sc20hr11 ?

Attached pic of new/old plug

Thanks

 

Someone (thank you!) linked to this in another thread.

 

I have to read the printout of all the dealer service reported to see what info is listed or check when I inspect.

Thank you, appreciate that.

Yeah, I don't know, typically I call around to the different dealerships I've used to get feedback from parts and service departments for non-OEM parts. Figured this is one or the other and would be nice to find a more logical analysis detailing situations, like environments maybe or fluids used where benefits one or the other. Neat to read they're both Iridium tips.

 

Thanks James for the update.
So as i understand, i can use for my rav4 sparks 16

 

Does denso website allow you to enter your vehicle stats and it'll tell you the plug you need? They should be on top of it.

 

My profile pictures showing SC20HR11 (old) and new SC16HR11. There is nothing wrong with older plugs if you drive it often in the highway. I checked mine at 60k miles in my Auris touring sport 2015 with Prius engine. You know what, I put the old plugs back since I know the wear is almost 0, no gap change from super hard Iridium alloys. I return the SC16HR11 and wait for another 60k. Toyota Europe asked for 60k miles interval instead of 120k miles interval like in USA because European are ignorance and paranoids, how could a car last that long on spark plugs. They even do not believe car can last 200k miles without major issue. All my Toyota pass 200k miles when I was in USA for more than a decade without any major issue and most european, especially Germans dropped their Jaws. Since European cars expectation life is less than 100k miles before expensive repair.

 

This is an article on Densos website.

Supersessions within the Spark Plug range
30 June 2017 | Article

Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT). Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11

Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT)

For automotive applications, Iridium TT will supersede a part of the Iridium Power and Iridium Tough range.

After 20 years of 0.4mm patented Iridium we are now moving forward with Iridium TT long life for
automotive applications. Iridium TT utilizes 0.4mm center electrode, with an addition of a needle type ground electrode. This new development is the next step of evolution in Iridium technology and continues the high quality legacy of Iridium Power and Tough.

From June 2017 we will automatically supersede the phased out Iridium Power and Iridium Tough references to the new Iridium TT. You will receive stock of the new IrTT plug if the old stock is depleted. This will ensure delivery of the correct alternative Spark Plug in case you order the old reference.
Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11

Part Number SC20HR11 will be phased out. Due to OE requirements all demand will continue to the existing SC16HR11.

In the past only the 2014 Aygo/108/C1 and Yaris had 16 heat range, however going forward all other engines will move from SC20HR11 to the SC16HR11 Spark Plug. For Aftermarket it is safest to switch gradually to SC16HR11 for the whole connected car parc and sell out the current stock
of SC20HR11. We will supersede SC20HR11 with SC16HR11 automatically in terms of ordering and delivery, following Toyota’s decision. Please refer to the DENSO Spark Plug catalogue for the correct crossing.

Due to OE requirements DENSO has to change the heat range from 20 to 16. These connected applications are mainly Toyota engines. The OE car manufacturer has already switched to SC16HR11 for newly manufactured vehicles. The Aftermarket will follow this consequently.

The level of heat range is connected to low or high speed driving. The initial choice for the right heat range is a result of expectations towards average use of the engine. After a few years of experience with this engine, the manufacturer decided to lower the heat range.

In all digital catalogues like TecDoc and MAM, the change will take effect in June 2017.

From June 2017 onwards we will automatically supersede SC20HR11 with SC16HR11. This will ensure delivery of the correct Spark Plug in case you order the old reference.

Find out more about DENSO's Spark Plugs.

 

The 20's have a heat range of 20
The 16's have a heat range of 16

 

Denso is pushing the IXEH20TT and I already bought them, so I'll put them in. If I have any troubles I'll report back. I'm doing a cleanign of the EGR "circuit" so if mileage is affected it won't be possible to determine exactly why.

'10 Prius 3, 190k miles.