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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 | #11,757 in Automotive ( See Top 100 in Automotive ) #64 in Automotive Replacement Spark Plugs |
| Brand Name | Bosch |
| Compatible with Vehicle Type | Car, SUV, Truck |
| Core Material | Iridium |
| Customer Reviews | 4.5 4.5 out of 5 stars (548) |
| 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 |
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**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 !
V**N
As seen
Good
Z**Z
Gives you that spark you need
Shockingly good.
A**Z
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.
J**J
Good brand
Working well so far
Trustpilot
2 weeks ago
2 weeks ago