Bosch 0250201055 Diesel Glow Plug

Bosch Diesel Glow Plug 0250201055

Bosch Diesel Glow Plug 0250201055 is a direct-fit diesel glow plug built for Mercedes-Benz diesel engines that need fast, reliable cold starts and stable pre-heating performance. It uses Bosch Duraterm dual-control coil technology to shorten glow time and improve current regulation during start-up and post-glow operation.

Key Features

• Duraterm dual-control coil design for faster heat-up and controlled current draw
• Inconel heating element material for high-temperature durability
• Threaded terminal type with tapered seat for OE-style service fitment
• 12 mm thread diameter and 12 mm hex size
• Pre-heating time: 4.0 seconds
• Total length: 2.716535 in. with 23.0 glow plug reach
• Compatible with Mercedes-Benz diesel applications listed below

Product Details

Bosch 0250201055 is part of the Bosch Diesel Glow Plug line, which focuses on diesel starting performance and controlled combustion support during cold operation. The dual heating and regulating coil design helps the plug reach operating temperature quickly, then manage heat output more efficiently during post-glow phases. That makes this Bosch glow plug a practical choice for Mercedes-Benz 300D, 300SD, 350SD, 350SDL, and S350 diesel models that rely on consistent ignition assistance in low-temperature conditions. This part cross-references Mercedes-Benz OE numbers 0001599901 and 0011590001 for the same application.

Vehicle Fitment

• Fits 1994-1995 Mercedes-Benz S350, N/A, Diesel Glow Plug
• Fits 1990-1993 Mercedes-Benz 300D, N/A, Diesel Glow Plug
• Fits 1992-1993 Mercedes-Benz 300SD, N/A, Diesel Glow Plug
• Fits 1991 Mercedes-Benz 350SD, N/A, Diesel Glow Plug
• Fits 1990-1991 Mercedes-Benz 350SDL, N/A, Diesel Glow Plug

Common Issues This Part Can Address

• Hard starting during cold weather
• Extended cranking before the engine fires
• Uneven pre-heating in diesel start-up cycles
• Glow plug warning or starting complaints tied to worn plugs
• Reduced post-glow efficiency in diesel operation

Installation Notes and Tips

Verify thread diameter, reach, seat type, and terminal style before installation. Clean the cylinder head threads carefully and inspect the glow plug harness or connector condition at the same time. For Mercedes-Benz 300D, 300SD, 350SD, 350SDL, and S350 diesel applications, confirm the engine code and existing plug specification against the removed part to ensure proper match.

Quality Assurance

Bosch is a long-established diesel fuel and ignition technology manufacturer, and this glow plug reflects that experience with a controlled-heating design intended for dependable diesel starting performance. Bosch part number 0250201055 is engineered to OE-style specifications for the listed Mercedes-Benz diesel fitments.