Spot the Fake: Spark Plug

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If you’ve come across a great deal on-line or purchased from a parts shop and feel something is not quite right. This short video might help you identify non-genuine DENSO spark plugs.

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Wow at least Denso released an official vidoe how to identify them.

I am still waiting on an NGK Video.

VxOfame

My suggestion is to only buy them at the dealer, since this video was made some of the knock-offs now look exactly like the real thing. They last over 100, 000 so why save $20 - $30 and risk ruining your engine?

zuppagraves

The significant differences between fake spark plugs (in my case, this is DENSO SC20HR11 IRIDIUM) from the original are as follows. The central electrode did not have a laser-welded iridium washer/cylinder, and the side electrode had a stamped imitation of a "welded" resistance welding disk. These differences between the fake spark plugs and the genue spark plugs can only be seen using a binocular microscope.

ПетроВенгель

We have a group chat trying to identify some fake plugs, specially IQ24s where I received one with gold terminals and they have other colored terminals as well as some suspect laser marking and differences in our stamps

nathanielramirez

Hello may i ask this?
Do you manufature denso product in your country? If yes, do you make from scratches or you just assemble in your country using the parts from japan? And do you write "made in japan" or made in your country..?
I hope you understand.
Thankyou..

alvinlawanto

Did not know they fake spark plugs. Just bought some denso plugs from, Halfords for my citroen c1.

PeterSmith-lsut

So I bought 6 denso tt plugs from Rockauto for my GMC Sierra and picked up the other two from AutoZone. I installed them and started having random misfires on the 6 cylinders with the "denso" plugs from Rock Auto and the two cylinders with the plugs from AutoZone were fine. I pulled all the plugs and put my old AC Delco iridium's back in and zero misfires again. I will be contacting Rock Auto over this crap. I have pictures and videos of the 6 cylinders randomly misfiring as well as a video of zero misfires with old Delco plugs reinstalled. I gathered data with my bi directional scan tool and my HP Tuners software.

grominwithrob

I got some knock off ngk platinum spark plugs looked good. Ran fine. But what happened is they were already worn out at 25k miles.

jalee

got seller claiming bluish electrode around tip is original..is it?

prototype

I had no idea this crap was going on till i went to buy some denso platinum tt's on amazon, read the comments, and saw people talking about fakes....wtf when u cant even rely on amazon to ship u the real thing...almost makes me move to another brand becuz i dont know where to get the real thing

skipx

Is WUXI-DENSO plugs, original? I have an old japan one and a Chinese WUXI-DENSO and I see some differences.

elmakednos

Hello Sir my car.corolla s 2013 owner use denso only i put njk spark plug is corret or no?

chadi

just recieved some iridium ik20l 5358 plugs... they Seem legit, no odd gapping, proper packaging, iridum tip looks like the darker metal and very fine... BUT the welds on the curved electrode are Atrocious, I mean on some of them Im actually worried about even risking installing these lest the electrodes fall off!.. Looked like they were welded by some kid in his 1st welding class..I was expecting beautiful HQ welds on the iridium especially... is this normal and just a bad batch maybe?

skipx

I bought from an authorized Denso reseller and the plugs look severely burnt just after 5K kilometers.

kamrulhassan

its not possible anymore to see the differences. I have fake ones and genuine ones in my hand and seems like the same thing. Both same finish and elements that Denso says to check.
I'm only sure about the genuines cause I've bought that from a Nissan dealer

g.n