This connector is commonly used in:

- GM LS1/LS2/LS3 coil packs – ignition control
- Toyota TPS (Throttle Position Sensor) – engine management
- Nissan CAS (Crank Angle Sensor) – round and square variants
- VW MP9 water temperature sensors – coolant monitoring

These applications span Opel, Toyota, Nissan, VW, and GM platforms, particularly in models from the late 1990s to early 2010s.

> 4-Pin Automotive Electrical Connector – R4 Series  
> This connector features four circular pin sockets arranged in a compact 2x2 grid, housed in a rugged black thermoplastic shell. Marked with “R4” and pin indicators, it is engineered for secure mating with ignition and sensor modules. Widely adopted across GM, Toyota, Nissan, and VW platforms, it supports robust electrical continuity in demanding automotive environments. Ideal for coil packs, throttle sensors, and crank angle sensors.