Denso 671-4321 Direct Ignition Coil Boot Kit

Denso Ignition Coil Boot Kit for Honda Fit and CR-Z

Denso 671-4321 is a direct ignition coil boot kit built for Honda applications that need OE-style boot fitment and consistent ignition transfer. It matches factory-installed boot form, color, and performance for a precise service replacement on the ignition system.

The Denso First Time Fit COP boot line is focused on exact replacement details, using construction that meets or exceeds OE/OES standards. For Honda Fit and Honda CR-Z service work, this helps restore proper coil boot contact and dependable spark delivery at the plug.

Key Features

• Direct ignition coil boot kit for Honda ignition service
• OE-style form, fit, color, and performance
• Silicone boot material for heat-resistant service use
• Black boot color
• Male/female terminal design with 1 terminal
• Part number 671-4321 for catalog lookup and ordering

Detailed Description

This Denso 671-4321 boot kit is made for drivers and technicians servicing ignition coil-on-plug systems on the 2009-2013 Honda Fit and 2011-2015 Honda CR-Z. It is built to mirror the factory boot profile so the replacement follows the original fit and electrical connection style without changing the ignition system layout. The silicone construction supports consistent insulation and durability in a high-heat engine environment.

Denso’s First Time Fit COP boot sets are positioned as OE-style replacements for factory boot service, and this line is intended for applications where exact dimensions and terminal configuration matter. If you are searching for a Denso ignition coil boot kit for Honda Fit or Honda CR-Z, part number 671-4321 is the direct reference to use.

This part cross-references GP - Guaranteed Parts (e.g., SPP111E) for the same application.

Common Issues This Part Can Help Address

• Worn or heat-damaged ignition coil boots
• Misfire concerns caused by poor boot-to-plug contact
• Cracked or hardened silicone insulation
• Intermittent ignition transfer at the spark plug
• Service replacement needs on Honda Fit and Honda CR-Z ignition systems

Installation Notes and Tips

Verify the vehicle year and model before installation. This boot kit is listed for 2009-2013 Honda Fit and 2011-2015 Honda CR-Z, and the application should match the existing coil-on-plug setup. Inspect the ignition coil, spark plug, and surrounding seals during service so the new boot can seat correctly and maintain proper contact.

Quality Assurance

Denso states that the First Time Fit COP boot set construction meets or exceeds OE/OES standards and is engineered to match factory-installed boot specifications. That makes Denso 671-4321 a technical replacement choice for Honda ignition maintenance where OE-style fit and performance are required.