Bosch 7405 Spark Plug

Bosch Nickel Spark Plug 7405 Overview

Bosch 7405 is a conventional nickel-copper spark plug built for steady ignition performance and OE-style service life. It uses a nickel-y yttrium center electrode with a copper core, a ceramic insulator, and a resistor design to support consistent spark delivery in secondary ignition systems.

This Bosch Nickel line spark plug is a direct choice for drivers searching for a Bosch spark plug 7405 for Volkswagen Golf, Volkswagen Jetta, BMW M3, BMW Z3, and Volkswagen EuroVan applications. The preset gap and flat seat design help keep service straightforward on the listed vehicles.

Key Features

• Bosch conventional nickel-copper spark plug for secondary ignition service
• Nickel-yttrium center electrode with copper core for durable electrode construction
• Resistor design with 5000 resistance rating
• Preset 1.6 mm gap; do not gap before installation
• Flat seat, non-projected insulator, and multiple ground electrode configuration
• 14 mm thread diameter, 19 mm reach, and 16 mm hex size
• Heat range 8 for applications specified by the vehicle manufacturer

Product Details

Bosch Part Number 7405 is engineered to meet or exceed original equipment specifications for nickel-copper core spark plugs. The Bosch Nickel product line focuses on conventional service parts with a heavy-duty electrode design, making this plug a practical OE-style replacement for vehicles that call for a preset-gap, resistor spark plug. It is listed for 1994-2002 Volkswagen Corrado, 1995-2002 Volkswagen Golf, 1994-2002 Volkswagen Jetta, 1995-1997 Volkswagen Passat, 1997 and 1999-2000 Volkswagen EuroVan, 1997-1999 BMW M3, and 1998-2000 BMW Z3.

Searches for Bosch 7405, Bosch Nickel 7405, and Bosch spark plug 7405 often point to the same conventional replacement part for older Volkswagen and BMW ignition service.

Common Symptoms This Part Can Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Service intervals due for a preset-gap OE-style spark plug

Installation Notes

• Do not gap this spark plug; the gap is preset from the factory.
• Verify the vehicle calls for a 14 mm thread, 19 mm reach, flat seat plug before installation.
• Confirm the heat range and resistor specification match the engine requirements.
• Use the vehicle service information for torque and removal procedures.
• For fitment searches, this part is commonly referenced for 1995-2002 Volkswagen Golf, 1994-2002 Volkswagen Jetta, and 1997-1999 BMW M3 applications.

Quality Assurance

Bosch manufactures this spark plug to OE-level dimensional and performance specifications for nickel-copper applications. The nickel-yttrium electrode construction, copper core, ceramic insulator, and resistor design reflect the brand’s conventional ignition component engineering for listed Volkswagen and BMW applications.