Denso 673-9303 Direct Ignition Coil

Denso 673-9303 Ignition Coil

Denso 673-9303 is a direct ignition coil in the Coil on Plug line, built for 12-volt systems and finished in black. It is a fitment-based replacement for select Audi and Volkswagen applications, including Audi A4, Audi A5, Q5, and Volkswagen GTI, Jetta, and Passat models.

Key Features

• Direct ignition coil for Coil on Plug applications
• 12-volt electrical specification
• Black housing
• OE-style replacement for select Audi and Volkswagen engines
• Denso stick coil technology with inspection and testing focused on consistent output

Product Details

The Denso Coil on Plug line is engineered for vehicles that use individual ignition coils mounted directly over the spark plug. Part number 673-9303 is a direct ignition coil for a wide range of Audi and Volkswagen models, including Audi A4, A4 Quattro, A5, Q5, and Volkswagen Golf, GTI, Jetta, Passat, and Tiguan applications. Denso applies controlled testing and inspection processes to help maintain ignition performance and electrical consistency across the application range.

This part cross-references Bosch 0 221 604 115 and Standard Ignition UF575 for the same application.

Common Symptoms This Part May Address

• Engine misfire under load or at idle
• Rough running after startup
• Hard starting caused by weak ignition output
• Check engine light related to ignition coil faults
• Loss of power or hesitation during acceleration

Installation Notes and Tips

Verify the engine code and connector style before installation, since fitment varies by year and model. Confirm the vehicle uses a Coil on Plug ignition setup and match the application to the exact Audi or Volkswagen model listed for Denso 673-9303. Inspect spark plugs and related ignition components during service to help prevent repeat coil failure.

Quality Assurance

Denso backs this ignition coil with manufacturing controls centered on testing and inspection for consistent quality. The Coil on Plug product line is built to meet the demands of modern direct ignition systems used in Audi and Volkswagen vehicles.