Audi S4 B9 A5 F5 Q7 4N Crankshaft Position Pulse Sensor 057906433B

Audi S4 B9 A5 F5 Q7 4N Crankshaft Position Pulse Sensor is an original powertrain component designed for precise monitoring of crankshaft operation in Audi engines. Thanks to its factory specifications, it ensures stable integration with electronic control systems and maintains correct ignition and injection parameters. This is an ideal solution for users who expect reliable fitment and predictable powertrain performance.

Specifications and technical data

• SKU: 057906433B
• Mark: Audi
• Condition: Used
• OEM Part Number: 057906433B
• Substitutable numbers: 057906433B, 057 906 433 B
• Category: Crankshafts

Purpose and function in the powertrain

The crankshaft position sensor in Audi S4 B9, A5 F5, and Q7 4N models is responsible for real-time reading of the shaft's position and rotational speed. This information is critical for the engine control unit (ECU), which uses it to determine fuel injection and ignition timing. A properly functioning sensor helps maintain:

• stable engine operation across the entire RPM range,
• correct engine starting in both cold and warm conditions,
• consistent operation with safety and traction control systems.

Due to its design, which complies with Audi factory standards, this component works seamlessly with the original wiring and mounts, facilitating installation and reducing the risk of installation errors.

Technical characteristics and fitment

The presented sensor belongs to the group of components related to the Crankshafts category, which highlights its importance for the synchronization of the entire crank-piston system. The use of an original design ensures:

• proper geometry of the working part relative to the pulse wheel on the shaft,
• the correct output signal for the engine control unit,
• compatibility with the factory engine management software.

This solution is particularly recommended when diagnosing issues such as rough engine idling, intermittent stalling, starting difficulties, or error codes related to crankshaft and camshaft synchronization.

Product condition and service application

The offered sensor is a secondary market component in used condition, which allows for cost-effective repairs while maintaining the manufacturer's original specifications. This type of part is suitable for situations where:

• the existing sensor has suffered mechanical or electrical damage,
• there are periodic issues with starting or engine misfires,
• a quick replacement is necessary as part of routine maintenance.

Choosing an original used component allows you to maintain consistent engine performance parameters without the need for aftermarket replacements with uncertain characteristics.

Benefits of using an original Audi sensor

Using this sensor in an Audi S4 B9, A5 F5, or Q7 4N provides a range of practical service and operational benefits:

• Factory fitment – compatibility with the electrical installation and mounts in the engine bay.
• Consistent electronic integration – accurate signal for the engine control unit, reducing the risk of errors and limp mode.
• Economical repair – the ability to restore proper engine operation without excessive costs.

This solution is particularly attractive for users who want to maintain the original powertrain configuration while optimizing their repair budget.

If you are planning a comprehensive repair or upgrade of your Audi's engine area and need other components from the same group, such as a crankshaft, flywheel, or mounting hardware, check out the available parts in the Audi Crankshafts category.

For drivers considering service or replacement of drivetrain components, practical tips on choosing a transmission may also be useful – more information can be found in the article Transmission: manual, automatic, or DSG – common faults and a guide to buying a used gearbox.