Bosch 8112 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug

Bosch 8112 is an OE Fine Wire Double Platinum spark plug built for steady ignition performance and extended service life. It uses platinum on the center electrode and platinum inlay on the ground electrode to reduce gap erosion and maintain consistent firing over time.

Compatible With a wide range of vehicles, including Jeep Liberty, Dodge Ram 1500, Honda Civic, and Acura MDX applications that call for an OE-style double platinum plug. Bosch 8112 is a direct-fit secondary ignition service part for many 4-cycle engines.

Key Features

• Double platinum electrode design for improved durability and slower wear
• Fine-wire OE-style construction for consistent spark delivery
• Platinum center electrode tip with platinum and nickel-ytttrium ground tip material
• Resistor plug with 6000 resistance specification
• Projected ceramic insulator for stable combustion chamber exposure
• Flat seat, 14 mm thread diameter, 19 mm reach, and 16 mm hex size
• Preset 1.1 gap; do not gap during installation where vehicle notes specify preset gap

Product Details

The Bosch OE Fine Wire Double Platinum line focuses on OE replacement performance with long-term wear control. Bosch 8112 uses a platinum firing pin on the center electrode and a platinum inlay on the ground electrode, helping reduce gap erosion and maintain ignition consistency as mileage accumulates. The nickel-ytttrium and copper core construction supports heat transfer and stable operation in everyday driving conditions.

This spark plug is listed across many import and domestic applications, including 2002-2012 Jeep Liberty, 2002-2010 Dodge Ram 1500, 2001-2005 Honda Civic, and 2003-2006 Acura MDX. It also appears in fitments for Honda Odyssey, Honda Pilot, Honda Ridgeline, Jeep Grand Cherokee, Dodge Dakota, and Dodge Durango. Bosch 8112 is a practical choice when servicing OE Fine Wire Double Platinum applications that require a preset-gap plug.

This part cross-references NGK 7092 and Denso 4504 for the same application.

Common Problems This Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire codes related to plug wear or gap growth
• Reduced throttle response from weak spark delivery
• Maintenance intervals shortened by rapid electrode erosion

Installation Notes and Tips

• Verify the vehicle-specific application before installation, especially on Honda and Acura models with preset-gap requirements.
• Do not adjust the gap on applications marked “Do Not Gap, Gap is Preset.”
• Confirm thread diameter, reach, seat type, and hex size match the original plug.
• Use the correct torque procedure for the cylinder head material and plug seat style.
• Inspect ignition coils and boots during service to avoid repeat misfire concerns.

Quality Assurance

Bosch manufactures this spark plug to meet Original Equipment specifications for double platinum applications. The OE Fine Wire Double Platinum design is built around durability, stable ignition performance, and long service life in the listed vehicle applications.