Denso 673-3205 Direct Ignition Coil

Denso Direct Ignition Coil for Mazda Applications

The Denso 673-3205 direct ignition coil is a coil-on-plug replacement built around 12.0-volt operation and a black housing. It is a DENSO Certified Replacement Part for Mazda vehicles that use direct ignition coil technology, including Mazda 3, CX-5, CX-9, MX-5 Miata, CX-3, CX-30, CX-50, and Mazda 6 applications.

Denso’s direct ignition coil line focuses on precise testing and inspection to support consistent spark delivery and dependable ignition performance. If you are replacing a failing coil on a Mazda 3 or Mazda CX-5, the Denso 673-3205 offers an OE-style solution backed by Denso’s ignition coil engineering.

Key Features

• Direct ignition coil, coil-on-plug design
• 12.0-volt electrical specification
• Black finish
• DENSO Certified Replacement Part
• OE-style replacement for select Mazda ignition systems
• Part number: 673-3205

Detailed Product Overview

The Denso 673-3205 is engineered for direct ignition systems where each coil mounts directly to the spark plug. This design supports accurate ignition timing and consistent voltage delivery across a wide range of Mazda fitments. It is a strong match for drivers searching for a Mazda 3 ignition coil replacement, a Mazda CX-5 coil-on-plug part, or a direct ignition coil for Mazda CX-9 and MX-5 Miata models.

This part cross-references Delphi GN10625 and NGK 48895 for the same application. The Denso 673-3205 is also listed among interchange references including 6733205, PE20-18-100A, U5279, and UF656.

What This Part Helps Address

• Engine misfire caused by a weak ignition coil
• Rough idle from inconsistent spark output
• Hard starting related to ignition coil failure
• Check engine light conditions tied to ignition performance
• Loss of acceleration response from degraded coil output

Installation Notes and Fitment

Fits 2021-2023 Mazda CX-30, N/A. Fits 2023 Mazda CX-50, N/A. Fits 2016-2023 Mazda CX-9, N/A. Fits 2016-2023 Mazda MX-5 Miata, N/A. Fits 2012-2022 Mazda 3, N/A. Fits 2013-2022 Mazda CX-5, N/A. Fits 2014-2021 Mazda 6, N/A. Fits 2016-2021 Mazda CX-3, N/A.

Before installation, confirm the connector style, mounting location, and engine application against the vehicle’s original coil. Inspect spark plugs and related ignition components at the same time, since worn plugs can shorten coil life and affect ignition performance.

Quality Assurance

Denso applies controlled testing and inspection processes to its ignition coil production to support consistent quality. As a DENSO Certified Replacement Part, this coil reflects Denso’s focus on direct ignition technology for Mazda applications.