Bosch 55-557-326 Crankshaft Position Sensor

The Bosch 55-557-326 crankshaft position sensor is a critical engine management component that monitors the position and rotational speed of the crankshaft. This electronic sensor provides precise real-time data to the Engine Control Unit (ECU), enabling accurate control of ignition timing and fuel injection for optimal engine performance.

Key Features:

• Precision inductive sensor technology for accurate crankshaft position detection
• Monitors engine speed, crankshaft position, and rotational direction
• Essential for proper ignition timing and fuel injection control
• Includes O-ring seal for proper installation
• Direct OEM replacement quality from Bosch, the world's largest automotive component supplier

Application Notes:

This sensor is commonly used in SAAB vehicles equipped with Motronic and Trionic ignition systems, including models with B204, B205, B234, and B235 engines. Cross-references with OEM numbers 30561772 and 9177221. The crankshaft position sensor is one of the most critical sensors in modern engine management systems, and failure symptoms may include no-start conditions, extended cranking, rough idle, stalling, or check engine light illumination.