Bosch HR7MPP302X Spark Plug

Bosch OE Fine Wire Platinum Spark Plug

Bosch OE Fine Wire Platinum spark plug HR7MPP302X is built for direct replacement service in select Cadillac and Buick applications. It uses a fine-wire platinum center electrode and a tapered ground electrode to support reliable ignition, cleaner combustion, and steady fuel efficiency.

The Bosch OE Fine Wire Platinum line is engineered to meet or exceed original equipment specifications for platinum spark plugs, making it a practical OE-style choice for drivers maintaining factory-level ignition performance.

Key Features

• Platinum center electrode tip for durable spark delivery
• Fine-wire electrode design for improved ignitability
• Tapered ground electrode for OE-style combustion performance
• Resistor design with 6000 ohms resistance
• Pre-gapped to 1.1 mm
• 14 mm thread diameter, 25 mm reach, tapered seat
• Ceramic insulator with non-projected tip design
• Heat range 7 for specified engine applications

Detailed Description

Bosch HR7MPP302X is a platinum spark plug from the OE Fine Wire Platinum product line, built around a platinum firing pin on the center electrode and a standard tapered ground electrode. The nickel-y yttrium and copper core materials, ceramic insulator, and resistor construction are selected to support stable ignition performance in engines that call for a platinum OE-style plug. This part is a direct service option for 2004 Buick Rendezvous, 2004 Cadillac SRX, 2004-2005 Cadillac CTS, and 2005 Cadillac STS, including early-production CTS and STS applications noted for original platinum center electrode material. For shoppers searching for Bosch spark plug HR7MPP302X for Cadillac CTS or Bosch HR7MPP302X for Buick Rendezvous, this plug matches the listed OE-style configuration and dimensions.

Vehicle Fitment

• Fits 2005 Cadillac CTS, N/A
• Fits 2004-2005 Cadillac CTS, N/A
• Fits 2005 Cadillac STS, N/A
• Fits 2004 Buick Rendezvous, N/A
• Fits 2004 Cadillac SRX, N/A

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Misfire conditions related to aged ignition components
• Reduced fuel economy from degraded plug performance
• Loss of throttle response from weak combustion events

Installation Notes and Tips

Verify the engine application against the listed fitment before installation. Check the plug gap and thread condition during service, and install to the manufacturer’s torque specification for the engine. Because this plug uses a tapered seat and 14 mm thread diameter, confirm the cylinder head specification matches the OE-style dimensions before use.

Quality Assurance

Bosch designs the OE Fine Wire Platinum line to meet or exceed original equipment specifications for platinum spark plugs. Part number HR7MPP302X is built for OE-style service in the listed Cadillac and Buick applications and follows the dimensional and material requirements shown in the product data.