Bosch 9786 Spark Plug

Bosch OE Fine Wire Iridium Spark Plug 9786

Bosch 9786 is an OE Fine Wire Iridium spark plug built for steady ignition performance and extended service life. It uses an ultra-fine wire iridium center electrode, a projected ceramic insulator, and a resistor design to support consistent spark delivery in the ignition system.

Compatible with select Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman applications, this Bosch iridium spark plug is a direct-fit secondary ignition component for 2011-2016 Mini models listed below.

Key Features

• OE Fine Wire Iridium design for precise spark delivery
• Iridium center electrode tip with fine wire construction
• Platinum ground electrode tip material with standard J-gap configuration
• Resistor spark plug with 6000 resistance specification
• Flat seat, 12 mm thread diameter, 14 mm hex size
• Projected ceramic insulator for OE-style fitment
• Pre-gapped to .8 for the listed application

Product Details

Bosch OE Fine Wire Iridium line focuses on OE-level ignition performance with materials chosen for durability and stable combustion. Part number 9786 uses an iridium center electrode and copper core construction to support reliable firing characteristics, while the platinum-tipped ground electrode helps maintain electrode integrity over time. This Bosch 9786 spark plug is engineered for 4-cycle engines and matches the listed Mini fitments for 2011-2016 model years.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

• Engine misfire caused by worn spark plug electrodes
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Ignition service needs on Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman models

Installation Notes

Verify thread diameter, reach, seat type, and pre-gap before installation. Bosch 9786 uses a 12 mm thread, 26.5 reach, flat seat, and non-removable nut terminal. Confirm the vehicle’s engine specification against the listed fitment before service, and follow the manufacturer’s torque procedure for spark plug installation.

Fits 2011-2015 Mini Cooper, N/A. Fits 2011-2016 Mini Cooper Countryman, N/A. Fits 2013-2016 Mini Cooper Paceman, N/A.

Quality Assurance

Bosch is known for OE-focused ignition components, and the OE Fine Wire Iridium line is built around factory-style materials and dimensions for the listed applications.