Facet 9.3257 Ignition Knock (Detonation) Sensor

Facet 9.3257 Knock Sensor for Mazda

Facet 9.3257 is an ignition knock sensor for select Mazda applications. It supports accurate detonation detection so the engine control system can respond to abnormal combustion events. This part number is used on multiple Mazda 3, Mazda 6, CX-5, CX-3, MX-5 Miata, and Mazda 2 applications.

Key Features

• Ignition knock (detonation) sensor for emission control and engine management systems
• Direct-fit application coverage for select Mazda models
• Fits 2018-2021 Mazda CX-3, without cable
• Fits 2014-2019 Mazda 3 Sport, without cable
• Fits 2018-2019 Mazda 6, without cable
• Fits 2018-2019 Mazda CX-5, without cable
• Fits 2018 Mazda 3, without cable
• Fits 2018 Mazda MX-5 Miata, without cable
• Fits 2015-2017 Mazda 2, without cable
• Fits 2016-2017 Mazda CX-3
• Fits 2016-2017 Mazda MX-5 Miata
• Fits 2012-2016 Mazda 3
• Fits 2014-2016 Mazda 6
• Fits 2013-2016 Mazda CX-5

Detailed Description

Facet 9.3257 is a knock sensor used to monitor engine vibration patterns associated with detonation. On Mazda 3, Mazda 6, CX-5, CX-3, MX-5 Miata, and Mazda 2 applications, the sensor provides the signal the engine control module uses to manage ignition timing and combustion control. If your vehicle is showing knock sensor-related faults, this part number is a direct replacement for the listed fitments.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Is Used For

• Knock sensor fault codes
• Engine pinging or detonation-related drivability concerns
• Reduced ignition timing control from a failed sensor signal
• Check engine light tied to knock sensor diagnostics
• Restoring proper engine management input on listed Mazda models

Installation Notes and Tips

Verify the connector style and application notes before installation. Some listed Mazda fitments specify “without cable,” so match the existing sensor configuration on the vehicle. Confirm the exact model year and engine setup against the fitment list for Mazda 3, Mazda 6, CX-5, CX-3, MX-5 Miata, and Mazda 2 applications.

Quality Assurance

Facet is a recognized aftermarket brand for engine management and sensor applications. Part number 9.3257 is built for the listed Mazda fitments and should be matched to the vehicle’s original sensor configuration for proper service.