Bosch 8121 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug 8121

Bosch 8121 is an OE Fine Wire Double Platinum spark plug built for direct replacement service in select Nissan and Suzuki applications. It uses platinum on the center electrode and a platinum inlay on the ground electrode to help control gap wear and maintain consistent ignition performance over time.

OE Fine Wire Double Platinum Design

The Bosch OE Fine Wire Double Platinum line focuses on OE-style ignition performance with durability features that matter in daily driving. This plug uses a platinum center electrode tip, platinum and nickel-ytttrium ground electrode tip material, a projected ceramic insulator, and a resistor design rated at 6000 ohms for stable secondary ignition operation. The flat seat, 12 mm thread diameter, 14 mm hex size, 26.5 mm reach, and 1.1 pre-gap size align with OE replacement requirements for the listed vehicles.

• Platinum center electrode tip for long service life
• Platinum inlay on the ground electrode to reduce gap erosion
• Resistor design for ignition noise control
• Projected ceramic insulator for OE-style combustion positioning
• Flat seat and OE-style dimensions for listed Nissan and Suzuki applications

Vehicle Fitment

• Fits 2024 Nissan Versa, N/A
• Fits 2012-2020 Nissan Versa, N/A
• Fits 2019 Nissan Frontier, N/A, to 04/2019; original center electrode and ground electrode material is platinum
• Fits 2005-2019 Nissan Frontier, N/A; original center electrode and ground electrode material is platinum
• Fits 2019 Nissan Frontier, N/A, from 05/2019; original center electrode and ground electrode material is platinum
• Fits 2013-2019 Nissan Sentra, N/A, without California Emission System; original center electrode and ground electrode material is platinum
• Fits 2019 Nissan Versa Note, N/A, from 05/2019; original center electrode and ground electrode material is platinum
• Fits 2014-2018 Nissan Versa Note, N/A
• Fits 2012 Nissan Sentra, N/A, without California Emission System; original center electrode material is iridium and ground electrode pin material is platinum
• Fits 2009-2012 Suzuki Equator, N/A; original center electrode and ground electrode material is platinum
• Fits 2007-2011 Nissan Sentra, N/A; original center electrode and ground electrode material is platinum

Common Service Uses

• Misfire caused by worn spark plug electrodes
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Loss of fuel efficiency from degraded plug performance
• Maintenance replacement for OE-style platinum ignition systems

Installation Notes

Verify the engine application, emission package, and OE plug specification before installation. Confirm the 12 mm thread diameter, 26.5 mm reach, flat seat, and pre-gap size match the original plug specification for the vehicle. Bosch 8121 is a direct spark plug replacement for the listed Nissan Versa, Nissan Frontier, Nissan Sentra, Nissan Versa Note, and Suzuki Equator applications.

Quality Assurance

Bosch OE Fine Wire Double Platinum spark plugs are built to meet original equipment specifications for double platinum applications. The double platinum electrode design is used to improve durability by reducing gap erosion and supporting longer service life in the specified vehicles.