Denso 673-4025 Direct Ignition Coil

Denso 673-4025 Direct Ignition Coil

Denso 673-4025 is a direct ignition coil built for Coil on Plug applications where stable voltage delivery and consistent spark output matter. This 12-volt, black ignition coil is a fitment-based replacement for select Infiniti and Nissan models, including G35, M35, M45, FX35, and 350Z applications.

DENSO’s Coil on Plug line reflects its focus on stick coil technology, with testing and inspection processes used to verify ignition coil quality before release. If you are replacing a failing coil on an Infiniti G35 or Nissan 350Z, this part number is a direct-reference option to compare against OE-style applications.

Key Features

• Direct ignition coil for Coil on Plug systems
• 12-volt electrical specification
• Black housing
• OE-style fitment for select Infiniti and Nissan vehicles
• Part number 673-4025 for easy lookup and cross-reference

Detailed Description

This Denso ignition coil is engineered for vehicles that use individual coil-on-plug ignition at each cylinder. It is listed for 2003-2007 Infiniti G35, 2006-2008 Infiniti M35, 2009 Infiniti M45, 2003-2008 Infiniti FX35, and 2003-2006 Nissan 350Z applications. For buyers searching for a replacement ignition coil for Infiniti G35 3.5L or Nissan 350Z coil on plug service, Denso 673-4025 provides a direct part-number match for those confirmed applications.

This part cross-references Standard Ignition UF401 for the same application.

Common Issues This Part May Address

• Engine misfire caused by a weak ignition coil
• Rough idle or hesitation during acceleration
• Hard starting related to inconsistent spark delivery
• Check engine light triggered by ignition coil fault codes
• Loss of power under load from coil breakdown

Installation Notes and Tips

Verify the vehicle year, make, model, and engine configuration before ordering. Confirm the existing coil connector style and compare the part number 673-4025 to the removed unit before installation. Inspect spark plugs, boots, and related ignition components during service, since worn plugs can shorten coil life and affect ignition performance.

Quality Assurance

Denso applies controlled testing and inspection procedures to its ignition coil line to support consistent product quality. The Coil on Plug product line is built around Denso’s experience with stick coil technology and OE-style ignition service parts.