Bosch 8157 Spark Plug

Bosch OE Fine Wire Double Platinum Spark Plug 8157

Bosch 8157 is an OE Fine Wire Double Platinum spark plug built for steady ignition performance and extended service life. It uses platinum on the center electrode and platinum in the ground electrode to help reduce gap erosion while maintaining OE-style specifications for double platinum applications.

Compatible With select Nissan Sentra, Altima, 240SX, Pathfinder, and Toyota Corolla applications, this Bosch spark plug also fits a range of Infiniti, Saab, Mitsubishi, Lexus, Subaru, and Dodge models. The fine wire center electrode and resistor design support consistent spark delivery in 4-cycle engines.

Key Features

• Part number 8157 Bosch spark plug for OE-style replacement use
• Double platinum design with platinum center and ground electrode tips
• Fine wire center electrode for precise ignition performance
• Resistor spark plug with 6000 resistance
• 14 mm thread diameter, 19 mm reach, and flat seat design
• Ceramic insulator with non-removable nut terminal
• Standard J-gap ground configuration with one ground electrode

Product Details

Bosch OE Fine Wire Double Platinum spark plugs are engineered around original equipment requirements for double platinum service. The platinum firing pin on the center electrode and platinum inlay at the ground electrode help limit wear at the gap, which supports stable performance over time. Bosch 8157 is a 4-cycle spark plug with a 16 mm hex size, heat range 5, non-projected insulator, and copper core construction in both the center and ground electrodes.

This part number 8157 is a practical OE-style choice for drivers servicing older import and domestic engines that call for a double platinum plug. It is a direct fit for applications such as Nissan Sentra, Nissan Altima, Nissan 240SX, Toyota Corolla, and Saab 9000 models listed in the fitment data.

Common Issues This Part Can Address

• Worn spark plug electrodes causing weak ignition performance
• Gap erosion that can lead to inconsistent spark output
• Rough idle related to aged secondary ignition components
• Hard starting caused by degraded spark plug condition
• Misfire concerns tied to overdue spark plug replacement

Installation Notes and Tips

Verify the engine calls for a 14 mm, flat-seat, 19 mm reach double platinum spark plug before installation. Check the existing plug gap and compare it to the pre-gap specification when servicing the ignition system. Inspect coil boots, plug wires, and ignition components at the same time to help avoid repeat misfire concerns. Confirm the vehicle application by year, make, and model before ordering Bosch 8157.

Quality Assurance

Bosch designs this OE Fine Wire Double Platinum plug to meet original equipment specifications for double platinum spark plugs. The platinum-on-platinum electrode design is used to improve durability and maintain performance life in the listed applications.