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⚡ Spark your drive with Bosch Double Iridium – where longevity meets lightning-fast performance!
Bosch 9621 OE Fine Wire Double Iridium Spark Plug features dual iridium electrodes and a laser-welded ultra-fine wire design that reduces voltage requirements by 24% and lasts 4 times longer than standard plugs. With corrosion-resistant nickel-plated threads and factory pre-gapping, it ensures hassle-free installation and OE-level performance for modern gasoline engines, including Gasoline Direct Injection (GDI) models.



















| ASIN | B005GN1THO |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #463,770 in Automotive ( See Top 100 in Automotive ) #2,563 in Automotive Replacement Spark Plugs |
| Brand Name | Bosch |
| Compatible with Vehicle Type | Car, Truck |
| Core Material | Iridium |
| Customer Reviews | 4.6 4.6 out of 5 stars (171) |
| Gap Size | 0.04 inches |
| Global Trade Identification Number | 00028851034258 |
| Included Components | spark plug |
| Item Highlight | Replaces 4912 52280 52289 900-1373 900-1663 924-1373 924-1663. OE-grade replacement. |
| Item Type Name | Spark Plug |
| Item Weight | 1.44 ounces |
| Manufacturer | Bosch Automotive |
| Manufacturer Part Number | 9621 |
| Manufacturer Warranty Description | Limited |
| Model Number | 9621_1 |
| Number of Items | 1 |
| OEM Equivalent Part Number | 9621 |
| Thread Size | 12mm |
| Top Material Type | Nickel |
| UPC | 028851034258 |
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