Walker 921-2128 Ignition Coil

Walker ThunderSpark Ignition Coil for Infiniti

Walker ThunderSpark ignition coil Part Number 921-2128 is a direct-fit ignition coil for select Infiniti V8 applications. It is listed for multiple Infiniti M45, FX45, and Q45 model years, including fitments with and without boot and spring configurations.

Key Features

• Ignition coil for select Infiniti V8 engines
• Walker ThunderSpark product line
• Fits 2002-2010 Infiniti M45, FX45, and Q45 applications listed below
• Application-specific fitment for vehicles with notes for boot and spring variations
• Part Number 921-2128 for ordering and catalog matching

Fitment Details

• Fits 2006-2010 Infiniti M45, N/A, ThunderSpark
• Fits 2006-2008 Infiniti FX45, N/A, ThunderSpark
• Fits 2006 Infiniti Q45, N/A, ThunderSpark
• Fits 2004-2005 Infiniti FX45, N/A, Exc.Boot & Spring; Single Coil
• Fits 2005 Infiniti Q45, N/A, Exc.Boot & Spring; Single Coil
• Fits 2004 Infiniti M45, N/A, Exc.Boot & Spring; Single Coil
• Fits 2002-2004 Infiniti Q45, N/A, Incl.Boot and Spring; Single Coil
• Fits 2003 Infiniti FX45, N/A, Incl.Boot and Spring; Single Coil
• Fits 2003 Infiniti M45, N/A, Incl.Boot and Spring; Single Coil

What This Part Helps Address

• Engine misfire caused by a weak or failing ignition coil
• Rough idle during startup or at operating temperature
• Hard starting related to inconsistent spark output
• Loss of power under acceleration
• Check engine light conditions tied to ignition performance

Installation Notes and Tips

Confirm the exact year, model, and boot/spring note before ordering. This ignition coil is listed for specific Infiniti M45, FX45, and Q45 applications, and the fitment notes must match the vehicle configuration. Inspect related ignition components during service and verify connector condition before installation.

Quality Assurance

Walker ThunderSpark parts are cataloged for application-specific fitment, and this ignition coil is identified by Part Number 921-2128 for accurate vehicle matching. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.