Denso 3179 Spark Plug

Denso 3179 U-Groove Spark Plug

The Denso 3179 is a conventional spark plug built for stable ignition performance in select Porsche, Fiat, and Audi applications. Its U-Groove ground electrode design helps improve ignitability, supporting more efficient combustion in the engines it serves.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core for dependable 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 0.9 mm
• Manufacturer heat range 22

Product Details

This Denso U-Groove Conventional spark plug is engineered for direct replacement service in vehicles that call for the 3179 specification. The U-Groove design increases the spark path exposure at the electrode area, while the copper core and nickel electrode materials support consistent ignition characteristics under normal operating conditions. This part cross-references Denso Auto Parts XU22EPR-U for the same application.

Compatible vehicle applications include Porsche 911, Fiat 500, Audi A3 Quattro, and Audi TT Quattro. Use Denso 3179 when servicing ignition systems that require the listed thread, reach, seat, and heat range specifications.

Common Replacement Reasons

• Engine misfire or rough idle related to worn spark plugs
• Hard starting caused by weakened ignition performance
• Reduced fuel efficiency from degraded spark quality
• Incomplete combustion and hesitation under load
• Maintenance replacement for factory-style ignition service

Installation Notes

Verify thread diameter, reach, seat type, and heat range before installation. Set the gap to the vehicle specification if required, even though this plug is pre-gapped at 0.9 mm. Inspect ignition coils, boots, and plug wells for wear or contamination during service. Confirm fitment for your exact Porsche 911, Fiat 500, Audi A3 Quattro, or Audi TT Quattro application before installation.

Quality Assurance

Denso is known for OE-level ignition component engineering, and the U-Groove Conventional line focuses on reliable spark delivery with practical service-life materials. The 3179 is built to meet the dimensional and electrical requirements listed for the specified applications.