Ford Focus Mk3 Fiesta Mk7 B-Max Knock Sensor 1.2 1.6 Petrol 98MF-12A699-BA

Ford Focus Mk3 Fiesta Mk7 B-Max Knock Sensor is a component from the Engine sensors and switches group, responsible for precise monitoring of combustion in petrol engines. A properly functioning knock sensor allows the engine control unit (ECU) to mitigate engine knocking, which translates into stable operation, improved driving refinement, and protection of components. This component is designed for use in popular Ford models, such as the Focus Mk3 and Fiesta Mk7 with 1.2 and 1.6 petrol engines.

Specifications and technical data

• SKU: 1141998
• Mark: Ford
• Condition: Used
• OEM Part Number: 1141998
• Substitutable numbers: 98MF-12A699-BA, 98MF12A699BA, 1141998
• Fuel type: Petrol
• Part type: Sensor
• Category: Engine Sensors & Switches

The role of the knock sensor in Ford petrol engines

The knock sensor in Ford petrol engines is responsible for detecting unwanted vibrations resulting from knocking (detonation) in the combustion chamber. Based on the signal from this component, the engine controller can adjust the ignition timing to:

• increase the operational safety of the power unit under variable loads,
• reduce the risk of mechanical damage to pistons, bearings, and the cylinder head,
• maintain stable operating parameters with varying fuel quality.

For petrol engines used in the Ford Focus Mk3 and Fiesta Mk7, a properly functioning knock sensor is crucial for maintaining appropriate dynamics and predictable throttle response.

Compatibility and application in Ford Focus Mk3 and Fiesta Mk7

The presented sensor has been designed for 1.2 and 1.6 petrol engines used in Ford Focus Mk3 and Ford Fiesta Mk7 models. This ensures a perfect fit in terms of:

• mounting geometry to the engine block,
• signal characteristics compatible with the factory ECU,
• electrical connector matching the wiring harness in these models.

As a result, installation is straightforward, without the need for wiring modifications or the use of additional adapters, which helps maintain the factory operating parameters of the system.

Benefits of using an original Ford sensor

Choosing a knock sensor from the Ford range allows you to maintain consistency with the vehicle's factory specifications. In practice, this means:

• appropriate sensitivity and vibration filtering tailored to the engine design,
• proper cooperation with the engine control software,
• reduced risk of diagnostic errors related to incorrect signals.

For the user, this translates into more predictable vehicle behavior, fewer check engine light issues, and stable performance in daily operation.

Characteristics of the used component

The offered knock sensor is a used part, which, in the case of original parts for popular Ford models, represents a reasonable compromise between cost and functionality. Such a component, provided it maintains electrical and mechanical integrity, can continue to provide:

• accurate reproduction of engine vibrations across the full RPM range,
• a stable input signal for the controller,
• the possibility of continued operation without software interference.

This is a particularly attractive solution for maintenance repairs when you want to preserve the original characteristics of the power unit without incurring the costs of new components.

Support with selection and further system upgrades

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 temperature sensors, crankshaft position sensors, or switches related to engine operation, check the available parts in the Ford engine sensors and switches category.

For those interested in a broader look at electronics and control in modern cars, including the operation of engine controllers, an article describing the servicing of iDrive systems and electronic modules in BMWs may be useful – you can find it here: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.