Denso 3145 Spark Plug

Denso 3145 U-Groove Spark Plug

The Denso 3145 is a conventional spark plug built for direct ignition service across a wide range of import and domestic applications. Its U-Groove ground electrode design is engineered to improve ignitability, helping support more efficient combustion and consistent engine operation.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core for stable heat transfer
• Nickel center and ground electrode tip materials
• Standard ground configuration with a flat seat
• 14.00 mm thread diameter, 19.00 mm reach, and 16.0 mm hex size
• Pre-gapped to 0.8 mm

Product Details

Denso U-Groove Conventional spark plugs are built around a practical electrode layout that helps the spark kernel form more easily at the plug gap. On this Denso 3145 spark plug, the U-shaped ground electrode works with the copper-core center electrode to promote reliable ignition performance and steady engine efficiency. The conventional nickel construction and 5000 ohm resistance make it a straightforward replacement choice for many vehicles that call for this specification.

This part cross-references DENSO Auto Parts K20PR-U for the same application. It is also a direct service option for select vehicles such as Chevrolet Cruze, Chevrolet Sonic, Volkswagen Jetta, Audi A4, and Volvo S40 applications listed in the fitment data. Search terms such as Denso 3145 spark plug for 2013-2015 Chevrolet Cruze, 2000-2010 Volkswagen Jetta spark plug, and 2003-2009 Audi A4 ignition service match common buyer queries.

Common Symptoms This Part May Address

• Hard starting or extended crank time
• Rough idle or inconsistent combustion
• Misfire-related drivability concerns
• Reduced throttle response from worn plugs
• Ignition noise interference in the electrical system

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The Denso 3145 uses a flat seat and 0.8 mm pre-gap, so confirm the engine specification matches those values before service. For vehicles with fitment notes calling out special requirements, follow the application details exactly; for example, select Mercedes-Benz listings note that two spark plugs are required per cylinder. Always inspect the ignition coil, plug wires, and cylinder condition during spark plug replacement.

Quality Assurance

Denso manufactures this U-Groove Conventional spark plug to OE-style dimensional and material standards for dependable service in the listed applications. Confirm fitment against your vehicle’s year, make, model, and engine requirements before ordering.