Champion 9003 Spark Plug

Champion Iridium Spark Plug for OE-Style Ignition Performance

Champion Iridium 9003 is a spark plug built for precise ignition control and stable combustion. Its fine-wire iridium center electrode and platinum ground electrode help concentrate the spark for consistent firing in a range of import and domestic applications, including select Hyundai Sonata, Subaru Legacy, and Kia Sportage models.

Key Features

• Fine-wire iridium center electrode for sharp spark focus
• Platinum ground electrode core for durable electrode construction
• J-gap ground electrode tip design
• Resistor-type plug for ignition noise control
• Flat seat design with 0.75 reach and 14 mm thread diameter
• Pre-gapped at 0.041 in (1.05 mm)
• Champion Iridium classification, part number 9003

Product Details

Champion’s Iridium line is engineered around a fine-wire iridium center electrode paired with a platinum ground electrode to deliver a focused spark event. That construction supports reliable ignition performance in vehicles that call for a plug with a 0.041 in pre-gap, flat seat, and RC10WYPB4 plug type. The non-removable nut terminal and 15.880 mm hex size make it straightforward to service with standard ignition tools. This part number 9003 also cross-references Champion Spark Plug 7418 for the same application.

Fits 2006-2010 Hyundai Sonata, N/A; Fits 2002-2004 Subaru Legacy, N/A; Fits 1996-2002 Kia Sportage, N/A; Fits 1993-1997 Subaru Impreza, N/A; Fits 1995-1999 Hyundai Accent, N/A; Fits 2004-2007 Saturn Ion, N/A; Fits 2009 Audi A4 Quattro, N/A; Fits 1999 Chevrolet Tracker, N/A; Fits 1999 Suzuki Grand Vitara, N/A; Fits 1990-1991 Geo Storm, N/A.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire conditions tied to weak spark delivery
• Rough idle from degraded ignition performance
• Reduced throttle response from inefficient combustion
• Service replacement for vehicles calling for RC10WYPB4-style plugs

Installation Notes and Tips

Verify the vehicle’s required plug type, seat style, and gap specification before installation. Confirm the application calls for a 14 mm thread diameter, 0.75 reach, flat seat, and the listed gap range in the fitment notes. Use proper spark plug service procedures and torque to the vehicle manufacturer’s specification. For best results, inspect ignition coils, wires, and boots during plug replacement. Champion 9003 is also listed under the RC10WYPB4 plug type designation.

Quality Assurance

Champion Iridium plugs are built with iridium and platinum electrode materials selected for precise spark focus and durable service characteristics. The design follows Champion’s ignition component standards for secondary ignition service and OE-style replacement applications.