NGK 58403 Spark Plug Wire Set

NGK Spark Plug Wire Set for Land Rover

Restore consistent ignition performance with the NGK Spark Plug Wire Set, Part Number 58403. Built with blue silicone insulation and a noise-suppression design, this specific-fit wire set is made for select Land Rover Discovery, Range Rover, and Defender 90 applications.

NGK draws on decades of OE ignition experience to produce replacement ignition components that meet demanding durability and performance expectations. This NGK Spark Plug Wire Set is engineered for direct-fit service on 1996-1999 Land Rover models, including distributorless ignition applications on the 1999 Discovery.

Key Features

• Specific-fit spark plug wire set for select Land Rover vehicles
• Blue silicone insulation for heat resistance and flexibility
• Noise suppression design to help reduce ignition interference
• SMag core material for stable spark delivery
• 7.00 mm insulation outside diameter
• NGK Part Number 58403 / RC-EUX067

Detailed Description

The NGK 58403 spark plug wire set is built for direct replacement on 1996-1998 Land Rover Discovery, 1996-1998 Land Rover Range Rover, 1997 Land Rover Defender 90, and 1999 Land Rover Discovery with distributorless ignition. As part of the NGK Spark Plug Wire Set line, it reflects NGK’s focus on OE-level ignition components for domestic and import vehicles. The silicone insulation and noise suppression construction are selected to support reliable spark transfer while helping maintain clean ignition performance in demanding underhood conditions.

This part cross-references DENSO Auto Parts 671-8138 for the same application.

What It Helps Address

• Misfires caused by worn or damaged plug wires
• Hard starting related to weak ignition transfer
• Ignition noise that can interfere with engine operation
• Rough idle from inconsistent spark delivery
• Performance loss from deteriorated wire insulation

Installation Notes and Tips

Verify engine configuration and routing before installation, especially on 1999 Land Rover Discovery distributorless ignition applications. Match each lead to the correct cylinder position and inspect boots, terminals, and coil connections for wear before installing the new wire set. Confirm fitment by vehicle year, make, and model before ordering.

Quality Assurance

NGK manufactures ignition components to OE standards using controlled production and global distribution resources. The 58403 wire set is built to support dependable replacement service for select Land Rover Discovery, Range Rover, and Defender 90 applications.