Ford Focus Mk2 ST Engine Knock Sensor Unit 2.5 6M5G-12A699-AA

Ford Focus Mk2 ST Engine Knock Sensor Unit 2.5 is a precision component of the petrol engine control system, responsible for the reliable measurement of engine knocking. A properly selected sensor allows the engine control unit to safely adjust the ignition timing, which translates into stable operation of the 2.5 unit and reduces the risk of mechanical damage. This solution is particularly important in high-performance vehicles, such as the ST version.

Specifications and technical data

• SKU: 1371593
• Mark: Ford
• Condition: Used
• OEM Part Number: 1371593
• Substitutable numbers: 1371593, 6M5G12A699AA, 6M5G-12A699-AA
• Fuel type: Petrol
• Category: Oxygen Sensors

Function of the knock sensor in the Ford Focus Mk2 ST

The knock sensor in the 2.5 petrol engine monitors engine block vibrations and sends a signal to the ECU, which then adjusts the ignition timing accordingly. This allows the powertrain to operate within a safe range, even under dynamic loads and varying road conditions. A properly functioning component from this group helps reduce the risk of combustion chamber overheating, power loss, and rough idling at higher RPMs.

Benefits of using an original Ford sensor

In the case of a high-performance petrol engine, such as the 2.5 in the ST version, using a component from the Ford group ensures the correct signal characteristics and compatibility with the factory ECU software. A suitable knock sensor:

• supports stable performance during acceleration and highway driving,
• reduces the risk of uncontrolled engine knocking,
• facilitates diagnostics – the signal is consistent with the vehicle manufacturer's specifications,
• helps maintain the refinement of the 2.5 unit at the level expected in the ST version.

For the user, this means more predictable vehicle behavior and a lower risk of costly repairs resulting from prolonged driving with incorrect ignition timing.

Selection, compatibility, and application in a petrol engine

The presented sensor belongs to the Lambda probes and O2 sensors group, which are components responsible for precise monitoring of the powertrain's operation. Proper selection based on manufacturer markings and engine version is crucial for correct interaction with the control system. In the case of petrol units, it is particularly important that the sensor is adapted to the vibration characteristics of the specific block and cylinder head, which translates into the quality of the input signal for the ECU.

If you want to better understand how to safely use pre-owned electronic and measurement components in a car, it is worth reading our guide on selecting and installing such parts: Used automotive electronics – ECU modules and second-hand sensors.

Product characteristics and practical installation aspects

The offered knock sensor is a secondary market component, which allows for optimized service costs while maintaining the factory control system concept. In practice, installation involves correctly mounting the sensor on the engine block and connecting it to the wiring harness, while maintaining the appropriate tightening torque in accordance with service documentation. After replacement, it is recommended to perform computer diagnostics to verify that there are no errors related to the knock sensor signal.

For users who consciously choose dismantled parts and want to better understand their impact on the environment and operating costs, the following material describing the broader context of such decisions may be helpful: circular economy in the garage and the benefits of used parts.

Expanding the measurement system in Ford vehicles

If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other elements from the same group, such as additional oxygen sensors, control probes, or mixture composition monitoring elements, check out the available parts in the Ford Lambda probes and O2 sensors category.