Denso 3305 Spark Plug

Denso 3305 Spark Plug for Porsche Boxster

Denso 3305 is a conventional spark plug built with an OEM-specified special ground electrode configuration for stable ignition performance. It is a direct-fit choice for the 1999 Porsche Boxster and is identified by the Denso U-Groove Conventional line.

Key Features

• Part number 3305 spark plug for the 1999 Porsche Boxster
• U-Groove Conventional design with an OEM-specified ground electrode layout
• Multi-electrode ground configuration with two ground electrodes
• 5000 ohm resistor for ignition system noise suppression
• Copper center electrode core with nickel tip material
• Nickel ground electrode core and tip materials for conventional service use
• 0.9 mm pre-gap, 14.00 mm thread diameter, 19.00 mm reach, and 16.0 mm hex size

Product Details

The Denso U-Groove Conventional line focuses on practical OE-style ignition service, and this Denso 3305 spark plug follows that approach with a multi-electrode ground design specified for the application. For 1999 Porsche Boxster ignition service, the plug’s copper core helps conduct heat efficiently, while the nickel electrode materials support consistent spark delivery in a conventional plug format. The flat seat and 20 heat range are listed to match the required application details.

This part cross-references DENSO Auto Parts K20TNR-S9 for the same application. If you are searching for a 1999 Porsche Boxster spark plug, Denso 3305 is the cataloged replacement to review.

Common Reasons to Replace

• Engine misfire or rough idle
• Hard starting or extended crank time
• Reduced throttle response during acceleration
• Worn or fouled spark plug electrodes
• Service replacement for scheduled ignition maintenance

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and pre-gap before installation on the Porsche Boxster. Inspect the ignition system, plug wells, and coil condition during service, and follow the vehicle manufacturer’s torque specification when installing the spark plug. Confirm the part number 3305 against the vehicle application before final assembly.

Quality Assurance

Denso is an established OE supplier, and the U-Groove Conventional line is built around application-specific ignition requirements. This spark plug is cataloged for direct application matching on the 1999 Porsche Boxster.