Champion 9203 Spark Plug

Champion Iridium Spark Plug 9203 Overview

Champion Iridium 9203 is a secondary ignition spark plug built for direct-fit applications that call for RC12WLPB4. It uses a fine-wire iridium center electrode and a platinum ground electrode to sharpen spark focus and support consistent ignition performance in the vehicles listed below.

This spark plug is a fitment match for select Dodge Dakota, Dodge Durango, Dodge Ram 1500, Jeep Grand Cherokee, and Chrysler Concorde applications, along with additional BMW and Chevrolet models. The Champion Iridium line focuses on precise spark delivery and durable electrode materials for demanding engine service.

Key Features

• Champion Iridium part number 9203
• Fine-wire iridium center electrode for focused spark delivery
• Platinum ground electrode core material
• J-gap ground electrode tip design
• Resistor spark plug design
• Flat seat type with 0.75 reach and 14 mm thread diameter
• Pre-gapped at 0.039 in / 1.00 mm
• Non-removable nut terminal and 0.625 in hex size
• Plug type RC12WLPB4

Product Details

Champion Iridium 9203 is engineered around a fine-wire iridium center electrode and a platinum ground electrode to deliver a concentrated spark at the plug gap. That combination supports stable ignition characteristics in engines that specify RC12WLPB4, including applications such as 1997-2003 Dodge Dakota, 1998-2003 Dodge Durango, and 1997-2003 Dodge Ram 1500. It also fits select Jeep Grand Cherokee, Jeep TJ, Chrysler Concorde, BMW 750iL, and Chevrolet Prizm applications listed in the fitment data.

This part cross-references Autolite XP985 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition at the plug gap
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for vehicles calling for RC12WLPB4

Installation Notes and Tips

• Verify the engine calls for plug type RC12WLPB4 before installation.
• Check the specified gap for your application; listed fitments include 0.032 in, 0.035 in, 0.040 in, 0.044 in, and 0.028 in depending on vehicle.
• Confirm thread diameter, reach, seat type, and hex size match the cylinder head requirements.
• Use the correct torque procedure for the engine to avoid thread or seat damage.
• Inspect ignition wires or coil-on-plug components during service if misfire symptoms are present.

Quality Assurance

Champion Iridium 9203 is built to Champion’s iridium plug specification with a platinum ground electrode and resistor design for OE-style service in the listed applications. Fitment includes 1988-2003 model years across Dodge, Jeep, Chrysler, BMW, and Chevrolet applications shown in the vehicle data.