The Bosch 0242129521 spark plug is a high-quality nickel-based/copper core automotive ignition plug engineered to deliver reliable and consistent starting performance in petrol engines. Designed to meet or exceed original equipment quality standards, this spark plug is developed for a wide range of vehicles where the OEM specification calls for this part number.

Built with a nickel alloy ground electrode and a copper core center electrode, it ensures excellent conductivity and effective spark generation for optimal combustion. The plug is factory-pre-gapped for hassle-free replacement and features a nickel-plated housing and thread that protects against corrosion and seizure in the cylinder head.

Its robust construction and precise manufacturing make it suitable as a direct replacement on compatible petrol engines, helping maintain efficient engine starts, smooth idling, and steady acceleration throughout normal driving conditions.

Key Highlights:

• Designed to OEM fit and quality standards for reliable ignition performance.
• Nickel alloy electrode with copper core for good electrical conductivity and combustion stability.
• Factory set electrode gap simplifies installation.
• Nickel-plated housing resists corrosion and thread seizure.