Denso 673-9301 Direct Ignition Coil

Denso 673-9301 Ignition Coil Overview

The Denso 673-9301 is a direct ignition coil built for Coil on Plug applications on select Audi models. It uses a 12-volt design and a red housing, making it a direct OE-style replacement for drivers servicing ignition misfire concerns on Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro vehicles.

DENSO’s Coil on Plug line is backed by extensive testing and inspection processes focused on ignition coil quality and consistency. The 673-9301 is part of that product line and is built for reliable spark delivery in the applications listed below.

Key Features

• Direct Ignition Coil for Coil on Plug systems
• 12-volt electrical design
• Red coil housing
• OE-style replacement for select Audi ignition systems
• Part number 673-9301 for accurate ordering and lookup

Vehicle Fitment

• Fits 2002-2006 Audi A4 Quattro, Coil on Plug
• Fits 2002-2005 Audi A4, Coil on Plug
• Fits 2002-2004 Audi A6, Coil on Plug
• Fits 2002-2004 Audi A6 Quattro, Coil on Plug

Detailed Description

The Denso 673-9301 ignition coil is engineered for direct ignition systems used in select Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro models. As a Coil on Plug unit, it mounts directly at the spark plug location to support consistent ignition performance in the specified applications. If you are replacing a failing Audi ignition coil, the 673-9301 provides a straightforward match for the listed fitments.

This part cross-references Bosch 0 986 221 053 and Standard Ignition UF483 for the same application.

Common Issues This Part Can Address

• Engine misfire under load or at idle
• Rough running after ignition coil failure
• Hard starting caused by weak spark output
• Check engine light related to ignition coil faults
• Intermittent spark loss on Coil on Plug systems

Installation Notes and Tips

Verify the part number and vehicle application before installation. Inspect the spark plug, connector, and surrounding ignition components for wear or contamination before replacing the coil. For best results, confirm the coil-on-plug layout matches the original unit on your Audi A4, Audi A4 Quattro, Audi A6, or Audi A6 Quattro.

Quality Assurance

DENSO states that this Coil on Plug product line is supported by thorough testing and inspection processes to help maintain ignition coil quality and consistency.