This connector style is widely used in:

- GM LS1/LS2/LS3 coil packs
- Toyota TPS and ignition systems
- Nissan CAS (round and square types)
- VW MP9 water temperature sensors

Due to its standardized design, visual identification alone is insufficient for pinpointing the exact vehicle. It’s used across Opel, Toyota, Nissan, VW, and GM platforms, especially in models from the late 1990s to early 2010s.

> 4-Pin Automotive Electrical Connector – R4 Series  
> This female connector features four circular pin sockets arranged in a 2x2 grid, housed in a durable black thermoplastic shell. Marked with “R4” and pin indicators, it is designed for secure mating with high-current ignition and sensor modules. Commonly found in GM LS-series coil packs, Toyota TPS units, and Nissan CAS systems, this connector supports robust electrical continuity in harsh automotive environments.