Bosch® 9659 - FineWire™ OE Fine Wire Iridium Spark Plug

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FineWire™ OE Fine Wire Iridium Spark Plug by Bosch®. Unlock your engine performance with Bosch Iridium spark plugs. The ultra fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode and platinum ground electrode help them to go the distance.


Electrode Tip Material: Iridium
Ground Electrode Tip Material: Nickel-Yttrium and Platinum
Ground Electrode Tip Design: Standard
Ground Electrode Quantity: 1
Insulator Material: Ceramic
Resistor: Yes
Nominal Gap: 0.050"
Spark Plug Gap: Pre-gapped
Spark Plug Thread Size: 14 mm
Spark Plug Reach: 0.438" (11 mm)
Wrench Diameter: 0.625"
Thread Diameter: 0.551"
Thread Length: 0.441"
Heat Range: 9
Seat Type: Tapered Seat
Quantity: 1 Piece


  • 360° continuous laser welding to fuse the iridium firing pin promotes durability and long life
  • Ultra fine wire design delivers exceptional ignitability and performance
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Tapered shape reduces flame shrouding for improved combustion and more power
  • Laser welded iridium-platinum alloy inlay promotes durability and long life
  • Copper core (when required) provides broader heat range to resist pre-ignition
  • Nickel-plated shell with rolled threads for complete anti-freeze and corrosion protection
  • Ribbed insulator design prevents misfires due to flash-over
  • Backed by a 7-year performance satisfaction guarantee

You don't have to choose between performance and service life because Bosch Iridium spark Plugs are engineered for both. Using innovative OE materials, designs, and processes, Bosch Iridium delivers the best in OE technology. To increase the lifetime of the spark plug, Bosch Iridium includes a high-content center electrode and a more consistent and powerful spark. Bosch Iridium spark plugs utilize laser welding on the ground electrode and 360° continuous laser welding on the center electrode to increase the durability of the plug. While competitors still employ pulse lasers or resistance welding to build their spark plugs, Bosch utilizes continuous laser welding which increases the durability of the plug.

Bosch®, a premier global supplier of services and technology, is a privately held company headquartered in Germany. Its operations have been divided into four main business sectors that include automotive technology, industrial technology, energy and building technology, and consumer goods. Bosch products and services are designed to fascinate and improve the quality of life by offering innovative and beneficial solutions. The company offers technology worldwide that is “Invented for Life.”

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Warranty Information

Bosch warrants its products to be free from defects in materials or workmanship for a period of 1 year/12,000 miles. The warranty period begins on the date the product is delivered. The warranty is granted to the end-user and applies to products which are purchased, installed, and used for the purposes for which they are originally designed. This warranty covers defects arising under normal use and does not cover malfunctions or failures resulting from misuse, abuse, neglect, improper installation, or incorrect maintenance. During the warranty period, Bosch will repair or replace, at no charge, a product that is defective in materials or workmanship. Bosch reserves the right to either repair or replace a defective component at its discretion and reserves the right to substitute an equivalent product under the terms of this warranty.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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Bosch® - FineWire™ OE Fine Wire Iridium Spark Plug
Bosch® 9659 - FineWire™ OE Fine Wire Iridium Spark Plug
Average Rating: 5 of 5
5 of 5
Perfect Spark Plugs
Iridium spark plugs by Bosch give the best spirit to my vehicle. I've been using these spark plugs already for a long time, so I can recommend them to other people.
WPosted by (Beuford, GA) / 2010 Kia Rondo
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