Ignition Coil Kit

The Bosch ignition coil is a direct ignition coil, also known as coil-on-plug, a system utilized in modern vehicles for improved packaging, performance, emissions, and maintenance. This design places the ignition coil directly over the spark plug, eliminating the need for spark plug wires and offering a virtually maintenance-free system apart from occasional spark plug and coil replacements. This kit contains 6 coils with boots, serving as a replacement for part number 12138657273 and is noted as the newest version by Bosch released in 2017. Symptoms of a failing ignition coil can include reduced fuel efficiency, decreased power output, and misfires. When installing new ignition coils, it is recommended to use dielectric grease to protect the spark plug boot and create a seal for enhanced ignition performance. Some sources indicate that Eldor has become the OE supplier for ignition coils on many BMW models, with this part number being the same coil used. It is important to note that for certain BMW models and years, such as the 745i/Li and 545i, a "Notes: Do not mix manufacturers of ignition coils" caution is provided. This suggests that all ignition coils in the system should be of the same brand for optimal performance and to avoid potential issues. While some users have reported success using these coils on vehicles where they are not explicitly listed, such as the 2014 BMW 535i, it is always best to verify fitment or consult with a specialist.