Bosch 9625 Spark Plug

Bosch OE Fine Wire Double Iridium Spark Plug 9625

Bosch 9625 is an OE Fine Wire Double Iridium spark plug built for direct replacement service in a wide range of Hyundai and Kia applications. It uses an iridium center electrode and a laser-welded ground electrode design to support strong ignitability, stable combustion, and long service life.

Key Features

• OE Fine Wire Double Iridium design for consistent spark delivery
• Iridium-alloy center electrode firing pin for durable performance
• Laser-welded ground electrode with iridium alloy inlay
• Fine-wire electrode layout for improved ignitability
• Resistor spark plug with a preset .8 gap
• Flat seat, projected insulator, and 16 mm hex
• 4-cycle spark plug construction for modern gasoline engines

Product Line Details

Bosch OE Fine Wire Double Iridium focuses on OE-style ignition performance with materials chosen for durability and consistent firing. The fine-wire electrode geometry and double-iridium construction are aimed at maintaining reliable spark quality over extended service intervals, making Bosch 9625 a practical choice for drivers who want factory-style fit and ignition behavior.

Detailed Description

This Bosch spark plug uses an iridium center electrode tip, platinum-iridium and nickel-ytttrium ground tip materials, and a ceramic insulator to handle demanding ignition conditions. The resistor design helps control electrical noise, while the preset gap means it should not be regapped before installation. Bosch 9625 is listed for applications including the Hyundai Kona, Hyundai Veloster, Hyundai Elantra, Hyundai Sonata, Hyundai Santa Fe, Hyundai Santa Fe Sport, Kia Forte, Kia Forte5, Kia Optima, Kia Soul, Kia Sportage, Kia Sorento, Kia Seltos, Kia Accent, and Kia Sportage-era 4-cylinder service applications across model years shown in the fitment data.

This part cross-references common OE-style ignition service references for the same application.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire conditions related to aged plugs
• Reduced throttle response from weak spark delivery
• Service intervals that call for iridium plug replacement

Installation Notes and Tips

• Do not gap this plug; the gap is preset from the factory.
• Verify engine code and build details before ordering, especially for Hyundai Elantra and Kona applications with fitment notes.
• Use the correct torque procedure for the flat-seat design to avoid thread or sealing damage.
• Inspect ignition coils and boots during spark plug service to prevent repeat misfire issues.
• Confirm Bosch 9625 against the vehicle’s original plug specification before installation.

Quality Assurance

Bosch OE Fine Wire Double Iridium spark plugs are engineered around OE-style materials and construction for dependable ignition performance and long service life. Part number 9625 is built to match the listed Hyundai and Kia applications in the fitment data.