Denso 5337 Spark Plug

Denso Iridium Power Spark Plug 5337

Denso Iridium Power spark plug 5337 is built for drivers who want precise ignition performance and stable combustion response. It uses a 0.4 mm iridium center electrode, a tapered cut ground tip, and a U-groove design to support efficient spark delivery in a wide range of Fiat, Jeep, Dodge, and Ferrari applications.

The Iridium Power line focuses on compact electrode design and durable materials for consistent ignition performance. For buyers searching for a Denso 5337 spark plug for a Fiat 124 Spider, Fiat 500X, or Jeep Renegade, this part combines a fine-wire iridium tip with a copper core center electrode and nickel ground electrode construction.

Key Features

• Part number 5337 from Denso Iridium Power
• 0.4 mm iridium center electrode for fine spark delivery
• Tapercut and U-groove ground electrode tip design
• 5000 ohm resistor for ignition noise control
• Copper core center electrode with iridium tip material
• Nickel ground electrode with standard configuration
• Flat seat, 12.0 mm thread diameter, 19.0 mm reach
• Pre-gapped at 0.9 mm

Detailed Description

Denso 5337 is an iridium spark plug engineered for secondary ignition systems that require a compact electrode profile and stable electrical characteristics. The 16.0 mm hex size, 27 heat range, and flat seat design support OE-style service replacement in confirmed applications. This spark plug is listed for 2017-2020 Fiat 124 Spider, 2018-2020 Fiat 500L, 2018-2020 Fiat 500X, 2017-2019 Fiat 500, 2018 Jeep Renegade, 2014-2017 Fiat 500L, 2016-2017 Fiat 500X, 2015-2017 Jeep Renegade, 2013-2016 Dodge Dart, 2012-2016 Fiat 500, and select Ferrari models including the 456 M GT, 456 M GTA, 550 Maranello, 456 M, 456 GT, and 456 GTA. This part cross-references DENSO Auto Parts IXU27 and Chrysler SP070507AC for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire conditions related to inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Ignition noise concerns in electronically sensitive systems

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and heat range against the vehicle’s service specifications before installation. Confirm the gap setting matches the application requirements; this plug is pre-gapped at 0.9 mm, but final verification is still recommended. Use proper torque procedures for flat-seat spark plugs and inspect ignition coils, boots, and wiring during service. Fits 2017-2020 Fiat 124 Spider, N/A. Fits 2018-2020 Fiat 500L, N/A. Fits 2018-2020 Fiat 500X, N/A. Fits 2017-2019 Fiat 500, N/A. Fits 2018 Jeep Renegade, N/A. Fits 2014-2017 Fiat 500L, N/A. Fits 2016-2017 Fiat 500X, N/A. Fits 2015-2017 Jeep Renegade, N/A. Fits 2013-2016 Dodge Dart, N/A. Fits 2012-2016 Fiat 500, N/A. Fits 2002 Ferrari 456 M GT, N/A. Fits 2002 Ferrari 456 M GTA, N/A. Fits 1997-2002 Ferrari 550 Maranello, N/A. Fits 1999-2001 Ferrari 456 M, N/A. Fits 1995-1998 Ferrari 456 GT, N/A. Fits 1997-1998 Ferrari 456 GTA, N/A.

Quality Assurance

Denso’s Iridium Power line is built around fine-wire iridium electrode technology and application-specific ignition specifications. Part number 5337 is listed with defined electrical and dimensional attributes to support accurate replacement selection for the confirmed Fiat, Jeep, Dodge, and Ferrari fitments.