Denso 3371 Spark Plug

Denso Iridium Long Life Spark Plug 3371

Denso 3371 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It is a direct-fit ignition component for a wide range of import and domestic applications, including Honda Civic, Jeep Liberty, and BMW 550i platforms.

Key Features

• Iridium center electrode tip for stable ignition performance
• Platinum chip ground electrode tip design for extended service life
• 5000 ohm resistor for noise suppression
• Copper center electrode core and nickel ground electrode core
• 0.8 mm pre-gap for precise factory-style setup
• 14 mm thread diameter, 19.00 mm reach, and flat seat design
• 16.0 mm hex size for standard service-tool access
• Manufacturer heat range 20

Product Details

The Denso Iridium Long Life line is engineered for drivers who want consistent ignition performance with OE-style fit and construction. Part number 3371 uses an iridium center electrode to support reliable spark delivery, while the platinum chip ground electrode design helps maintain long service intervals. This spark plug is manufactured to meet strict original-equipment standards for performance, durability, and emissions control.

Cross-reference: This part cross-references DENSO Auto Parts SKJ20CR-A8 for the same application.

Common Symptoms This Part Can Address

• Rough idle or inconsistent engine operation
• Hard starting caused by worn ignition components
• Misfire codes related to spark plug wear
• Reduced fuel economy from weak spark delivery
• Loss of throttle response under load

Fitment Notes

• Fits 2011 Dodge Nitro, N/A
• Fits 2002-2011 Jeep Liberty, N/A
• Fits 2006-2010 BMW 550i, N/A
• Fits 2006-2010 BMW 650i, N/A
• Fits 2006-2010 BMW X5, N/A
• Fits 2004-2010 Dodge Dakota, N/A
• Fits 2006-2010 Jeep Commander, N/A
• Fits 2005-2010 Jeep Grand Cherokee, N/A
• Fits 2004-2009 Dodge Durango, N/A
• Fits 2006-2009 Mitsubishi Raider, N/A
• Fits 2006-2008 BMW 750i, N/A
• Fits 2006-2008 BMW 750Li, N/A
• Fits 1997-2005 Acura EL, N/A
• Fits 2001-2005 Honda Civic, N/A
• Fits 1998-1999 Honda Civic, N/A
• Fits 1994-2003 Dodge Ram 2500, N/A
• Fits 1994-2003 Dodge Ram 3500, N/A
• Fits 2003 Mazda Protege, N/A
• Fits 1999 Mazda Protege, N/A
• Fits 1990-2002 Mazda 626, N/A
• Fits 1995-2002 Mazda Millenia, N/A
• Fits 2000-2001 Honda CR-V, N/A
• Fits 1992-2001 Honda Prelude, N/A
• Fits 1989-1997 Ford Probe, N/A
• Fits 1996-1997 Honda Accord, N/A
• Fits 1990-1997 Mazda MX-6, N/A
• Fits 1991-1995 Mazda MPV, N/A
• Fits 1990-1993 Mazda B2600, N/A

Installation Notes

Verify the thread diameter, reach, seat type, and hex size before installation. The pre-gap is specified at 0.8 mm, so confirm the gap matches the engine requirement before threading the plug into the cylinder head. Use the correct torque procedure for the vehicle and inspect ignition coils, boots, and wires during service, especially on Honda Civic, Jeep Liberty, and BMW applications.

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. The Iridium Long Life design is intended to deliver consistent service characteristics in factory-style ignition systems across the listed vehicle applications.