Bosch YR7MPP33 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug

Bosch YR7MPP33 is an OE Fine Wire Double Platinum spark plug built for stable ignition performance and extended service life. It uses platinum on the center electrode and platinum inlay on the ground electrode to reduce gap erosion and maintain consistent firing characteristics in Mercedes-Benz and Dodge Sprinter applications.

The Bosch OE Fine Wire Double Platinum line focuses on original-equipment style construction for vehicles that call for a double platinum design. For Mercedes-Benz G550, S550, E350, ML350, and related applications, this spark plug supports the factory-style ignition setup with a preset gap and resistor design.

Key Features

• Part number YR7MPP33
• Double platinum construction with platinum center electrode tip and platinum ground electrode inlay
• Resistor spark plug with 6000 resistance
• Preset .8 gap; do not gap before installation
• Flat seat, 12 mm thread diameter, 26.5 mm reach, 16 mm hex
• Ceramic insulator with non-projected insulator type
• Nickel-Yttrium and copper center electrode core material
• Standard ground configuration with one ground electrode

Detailed Description

Bosch YR7MPP33 is engineered for OE-style ignition performance where a double platinum spark plug is specified. The fine-wire platinum center electrode and platinum-enhanced ground electrode help limit wear at the firing surfaces, which supports consistent spark delivery over time. This construction matches the needs of many Mercedes-Benz engines, including G550, S400, C250, C300, E350, ML350, S550, and SLK350 applications, as well as Dodge Sprinter 2500 and Sprinter 3500 models listed in the fitment data.

As part of Bosch’s OE Fine Wire Double Platinum line, this plug is built around original-equipment specifications rather than a universal aftermarket format. The preset gap, resistor design, flat seat, and heat range 7 configuration make it a direct-match service part for vehicles that require this exact plug type. Bosch YR7MPP33 is a practical choice for drivers servicing Mercedes-Benz C350, E350, ML550, and GL550 ignition systems with the correct OE-style spark plug specification.

What It Helps Address

• Misfires caused by worn spark plug electrodes
• Hard starting from degraded ignition performance
• Rough idle related to inconsistent spark output
• Loss of throttle response from aged plugs
• Service intervals where OE-style double platinum plugs are specified

Installation Notes and Tips

• Fits 2006-2011 Mercedes-Benz C350, N/A
• Fits 2006-2011 Mercedes-Benz E350, N/A
• Fits 2006-2011 Mercedes-Benz ML350, N/A
• Fits 2007-2009 Mercedes-Benz SL550, N/A
• Fits 2007-2008 Dodge Sprinter 2500, N/A
• Fits 2007-2008 Dodge Sprinter 3500, N/A
• Do not gap this spark plug; the gap is preset from the factory
• Verify the engine calls for a flat-seat, 12 mm, 26.5 mm reach double platinum plug before installation
• Use the vehicle’s OE service specification for torque and replacement interval

Quality Assurance

Bosch builds this spark plug to meet original equipment specifications for double platinum applications. The platinum firing surfaces and OE-style construction are intended to support durability and consistent ignition performance in the listed Mercedes-Benz and Dodge Sprinter fitments.