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⚡ Spark your engine’s potential with Bosch Double Iridium – performance that lasts and impresses!
Bosch 9621 OE Fine Wire Double Iridium Spark Plugs combine ultra-fine iridium firing pins and ground electrodes with 360-degree laser welding to reduce voltage needs by 24% and extend spark plug life by 4X compared to copper plugs. Pre-gapped and corrosion-resistant, these plugs ensure easy installation and optimal performance for modern GDI engines across multiple premium vehicle brands.
| ASIN | B0762GB2TM |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #12,629 in Automotive ( See Top 100 in Automotive ) #61 in Automotive Replacement Spark Plugs |
| Brand | Bosch |
| Brand Name | Bosch |
| Compatible with Vehicle Type | Car, SUV, Truck |
| Core Material | Iridium |
| Customer Reviews | 4.6 out of 5 stars 566 Reviews |
| Gap Size | 0.04 Inches |
| Global Trade Identification Number | 00028851034265 |
| Included Components | Spark Plugs |
| Item Type Name | Spark Plugs |
| Manufacturer | Bosch Automotive |
| Manufacturer Part Number | 9621 |
| Manufacturer Warranty Description | Limited |
| Model Number | 9621 |
| Thread Size | 12mm |
| Top Material Type | Iridium |
| UPC | 028851034265 |
| Unit Count | 4.0 Count |
| Vehicle Service Type | Car, SUV, Truck |
R**R
Near OEM quality at 1/4 cost
Near OEM performance at 25% of the cost! Bosch Quality replaced NGKs/Toyota OEMs. Great value and now the engine is running smoothly! I have seen a slight improvement in my mpg @1mpg overall in mixed driving conditions.
J**.
Very Expensive
Had one cylinder misfiring so replaced coil and spark plug. Runs fine now, but old plug looked shot after only 5 months so I think the coil was the problem. Really good plug so far but very expensive.
A**A
Very good
The best quality. Runs like new again.
B**I
Upgrade from OEM
After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.
R**5
A reliable set of spark plugs.
They’re made in Germany, what else can you say
C**Y
Faulty plug? Otherwise great set
Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.
R**S
Quality Spark Plugs
Everyone has their favorites. These were one of three that were recommended for my vehicle. They do not need anti seize on threads. They are pre gapped. Easy install. I checked about anti seize lubricant. Special threads, anti seize not recommended. I checked gap. They all measured to spec. Quality product . Hope this helps and May God Bless !
A**R
NOT OEM for VK50VE
This is NOT a good fit for the Nissan/Infiniti VK50VE!!! Amazon lists this as being an OEM part, but it is not. OEM is from NGK. The VK50VE is a very finicky engine and putting anything other than true OEM in it is likely to cause issues. The gap is off, too. Look up the NGK part number on a cross reference chart to get the right plugs. It is not worth the risk you're taking to buy these.
K**R
works well in 2014 nissan pathfinder sl 3.5l engine
works well in 2014 nissan pathfinder sl 3.5l engine
M**E
Great buy.
This is a great buy. From Amazon warehouse. Difference between new and used is this. Customers return products that dont fit. They are open box. So if u buy one of these that actually fit your car you can get 50 percent off!
A**D
التيما 2021 تركب
ناسبت سيارتي التيما 2021
C**Z
Bon prix et bonne qualité.
Installés dans mon cx5 2016 et elles performent aussi bien que ceux d'origine de mazda.
J**R
Excelentes Bujías
Bujías 10/10 muy recomendadas
Trustpilot
2 days ago
2 weeks ago