Champion 9425 Spark Plug

Champion Iridium Spark Plug 9425

Champion Iridium 9425 is a secondary ignition spark plug built with a fine-wire iridium center electrode and a platinum ground electrode for a focused spark event. It is an OE-style replacement for a wide range of BMW, Mini, and Porsche applications, including BMW 230i, 330i, 530i, X1, X3, and Mini Cooper models.

Key Features

• Fine-wire iridium center electrode for sharp spark focus
• Platinum ground electrode core with platinum pad surface
• J-gap design with a 0.032 in. pre-gap
• Resistor-type plug for modern ignition systems
• Flat seat, cup terminal, and Bi-Hex hex design
• Champion Iridium line construction for OE-style service replacement
• Part number 9425 for easy catalog matching

Product Details

Champion Iridium 9425 uses an iridium center electrode and platinum ground electrode materials to support consistent ignition performance in direct-fit applications. The plug’s J-gap design, 0.032 in. pre-gap, 1.08 reach, and flat seat configuration align with the OE-style requirements listed for many BMW and Mini engines, while Porsche applications in the fitment data call for a 0.028 in. gap. This part cross-references BMW 12120040551 and 12120041666 for the same application.

Compatible With 2014-2020 Mini Cooper, 2016-2020 Mini Cooper Clubman, 2017-2021 Mini Cooper Countryman, 2017-2021 BMW 230i, 2017-2021 BMW 230i xDrive, 2017-2021 BMW M240i, 2017-2021 BMW M240i xDrive, 2017-2020 BMW 430i, 2017-2020 BMW 430i Gran Coupe, 2017-2020 BMW 430i xDrive, 2017-2020 BMW 430i xDrive Gran Coupe, 2017-2020 BMW 440i, 2017-2020 BMW 440i Gran Coupe, 2017-2020 BMW 440i xDrive, 2017-2020 BMW 440i xDrive Gran Coupe, 2017-2020 BMW 530e, 2017-2020 BMW 530e xDrive, 2017-2020 BMW X2, 2017-2020 BMW X4, 2017-2019 BMW 330i, 2017-2019 BMW 330i GT xDrive, 2017-2019 BMW 330i xDrive, 2017-2019 BMW 340i GT xDrive, 2017-2019 BMW 530i, 2017-2019 BMW 530i xDrive, 2017-2019 BMW 740e xDrive, 2017-2019 BMW 740i, 2017-2019 BMW 740i xDrive, 2017-2019 BMW X3, 2017-2019 Porsche 911, 2017-2021 Porsche 718 Boxster, and 2017-2021 Porsche 718 Cayman, with application-specific gap and terminal requirements noted in the fitment data.

What It Helps Address

• Misfire concerns caused by worn spark plug electrodes
• Hard starting from degraded ignition performance
• Rough idle related to inconsistent spark delivery
• Loss of throttle response from aged secondary ignition components
• Service replacement needs on OE-style BMW, Mini, and Porsche tune-ups

Installation Notes

Verify the engine application, terminal style, seat type, and specified gap before installation. The plug is pre-gapped at 0.032 in., but several listed Porsche applications require a 0.028 in. gap, so confirm the vehicle-specific specification before use. Use the correct torque procedure for the cylinder head material and inspect coil boots and ignition coils during service.

Quality Assurance

Champion Iridium 9425 is built as a precision ignition service part with iridium and platinum electrode materials for OE-style replacement use. The Champion Iridium product line is positioned for direct-fit secondary ignition service on late-model BMW, Mini, and Porsche vehicles.