Bosch 79157 Spark Plug

Bosch Nickel Spark Plug for Smart Fortwo

Bosch 79157 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a heavy-duty yttrium-enhanced nickel center electrode with a copper core, and it is engineered to meet or exceed original equipment specifications for nickel-copper core spark plugs.

Compatible With 2008-2015 Smart Fortwo, N/A. This Bosch Nickel line focuses on dependable secondary ignition performance for everyday driving, with OE-style construction and a resistor design for stable operation. Bosch 79157 is a direct-fit spark plug choice for Smart Fortwo models covered by the listed fitment.

Key Features

• Conventional nickel-copper spark plug design
• Yttrium-enhanced nickel center electrode with copper core
• Resistor type: yes; resistance: 6000
• Standard ground electrode tip design with J-gap configuration
• Flat seat, 12 mm thread diameter, 26.5 reach
• Ceramic insulator with non-projected insulator type
• Manufacturer heat range 7
• Hex size: 16 mm

Detailed Description

Bosch 79157 is part of the Bosch Nickel product line, which is positioned around practical ignition service life and OE-style fit. The nickel-copper construction pairs a copper core center electrode with nickel tip materials to support consistent spark delivery, while the resistor design helps maintain stable electrical performance in the ignition system. For drivers searching for a Bosch 79157 spark plug for Smart Fortwo 2008-2015, this part matches the listed application and secondary ignition specifications.

Use this spark plug when servicing ignition wear, restoring proper combustion efficiency, or replacing a worn plug that can affect idle quality and throttle response. The standard center electrode design, J-gap ground configuration, and flat seat make it a straightforward replacement for the specified Smart Fortwo applications. Bosch 79157 also cross-references Bosch ignition service needs for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting related to weak ignition output
• Misfire conditions from degraded plug performance
• Reduced combustion efficiency from excessive plug wear
• Inconsistent throttle response during normal driving

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and heat range against the vehicle’s service requirements before installation. Inspect the ignition coil, plug wires, and related secondary ignition components at the same time to avoid repeat service. Follow the manufacturer’s torque specification and gap verification procedure for the engine application.

Quality Assurance

Bosch engineers this spark plug to meet or exceed original equipment specifications for nickel-copper core spark plugs. The Bosch Nickel line is built for dependable service in standard ignition maintenance applications, including the listed Smart Fortwo fitment.