Denso 671-4211 Spark Plug Wire Set

Denso 7mm Ignition Wire Set for OE Fit

Denso First Time Fit ignition wire sets are built to match factory-installed wire sets in form, fit, color, and performance. This Denso 671-4211 spark plug wire set uses 7mm insulation and silicone spark plug boots for a direct OE-style replacement on select Ford, Mazda, and related applications.

Compatible with 1988-1993 Ford Festiva, 1989-1992 Ford Probe, 1992-1993 Mazda MX-3, and 1994-1997 Ford Aspire. The 671-4211 is a practical choice when you need a replacement ignition wire set that follows original routing and terminal style.

Key Features

• Denso First Time Fit ignition wire set
• 7mm insulation outside diameter
• Silicone spark plug boot material
• 180-degree spark plug end boot design
• Female spark plug end terminal type
• Male distributor coil end terminal type
• Built to meet or exceed OE/OES standards in construction

Product Details

The Denso 671-4211 spark plug wire set is engineered for vehicles that require a 7mm ignition lead with silicone boots and OE-style terminal configuration. Denso’s First Time Fit line is positioned for factory-like replacement, making it a strong match for drivers servicing ignition systems on Ford Festiva, Ford Probe, Mazda MX-3, and Ford Aspire models. This part cross-references NGK ZX19 for the same application.

Common Problems This Part Can Address

• Misfires caused by worn or deteriorated ignition wires
• Hard starting related to weak spark delivery
• Rough idle from damaged wire insulation or boot wear
• Intermittent ignition performance from poor terminal contact
• Voltage leakage from aging plug wire insulation

Installation Notes and Tips

Verify engine layout and wire routing before installation. Match each lead to the correct cylinder and coil/distributor terminal position, and confirm the 180-degree spark plug boot orientation clears surrounding components. Inspect plugs, cap, and coil condition at the same time to avoid repeat ignition faults. For fitment reference, this part fits 1988-1993 Ford Festiva, 1989-1992 Ford Probe, 1992-1993 Mazda MX-3, and 1994-1997 Ford Aspire.

Quality Assurance

Denso states that First Time Fit ignition wire sets are made to align with factory specifications for form, fit, color, and performance, with construction that meets or exceeds OE/OES standards.