Genuine Mazda Rear Left ABS / Wheel Speed Sensor • NF49-43-72YA

Genuine Mazda NF49-43-72YA Rear Left ABS / Wheel Speed Sensor

Replacement Genuine Mazda rear left ABS / wheel-speed sensor for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models from 2005 to 2015 listed in the compatibility table.

The wheel-speed sensor monitors the rotational speed of the left-hand rear wheel and sends this information to the vehicle’s ABS and dynamic stability-control systems. The control unit uses this signal to identify wheel lock, differences in wheel speed and potential loss of traction.

The sensor is mounted at the left-hand rear wheel and includes its attached electrical wiring lead. There is one left-rear sensor fitted per vehicle. This listing is for one Genuine Mazda sensor.

A failed or damaged sensor may illuminate the ABS, DSC or traction-control warning lights, produce an intermittent or missing wheel-speed reading, store a related diagnostic fault code or disable the affected driver-assistance systems. Common replacement reasons include cable damage, connector deterioration, corrosion, contamination or accidental damage during wheel-bearing, brake or suspension work.

• Part type: ABS / wheel-speed sensor
• Primary use: Measures left-rear wheel rotational speed for the ABS and stability-control systems
• Location: Left-hand rear wheel hub area
• Position: Rear left
• Quantity per vehicle: 1 rear-left sensor
• Quantity supplied: 1 sensor with attached wiring lead
• Brand: Genuine Mazda
• Part No.: NF49-43-72YA
• Also referenced as: NF494372YA
• Fitment note: Handed component for the left-hand rear wheel; the rear-right and front sensors are different parts

Fitment advice: This sensor is specifically for the left-hand rear wheel on confirmed Mazda MX-5 NC applications. It should not be used for the right-rear or either front-wheel position. For imported, modified or previously repaired cars, matching the original sensor position, connector and part number is recommended.

Other items to consider: When changing this part, you may also want to consider purchasing replacement wiring clips or mounting hardware and inspecting the wheel-bearing magnetic encoder, electrical connector, brake components and nearby suspension fittings.

Useful tools / consumables: Suitable vehicle lift or trolley jack and axle stands, wheel-removal tools, socket set, penetrating fluid, electrical-contact cleaner, nylon cleaning brush, torque wrench and diagnostic equipment capable of reading ABS fault codes and live wheel-speed data.

Difficulty guide: DIY Difficulty: Moderate. Installation requires the vehicle to be raised and supported safely and the left-rear wheel removed. The sensor wiring must be released from its retaining points without damaging the connector, and corrosion around the mounting point can increase the removal difficulty.

Why Genuine Mazda? Genuine Mazda ABS components are designed for the original sensor mounting point, electrical connector and vehicle control system. Correct sensor positioning and electrical compatibility help provide an accurate wheel-speed signal and reliable operation of the ABS, traction-control and stability-control systems.

What’s in the box: One Genuine Mazda rear left ABS / wheel-speed sensor with attached wiring lead, part number NF49-43-72YA.

Installation notes: Raise and support the vehicle safely before removing the left-hand rear wheel. Disconnect the electrical connector and release the wiring lead from each retaining point before removing the sensor. Clean the mounting area carefully, route the replacement wiring in the original position and secure all clips and fasteners. Clear stored fault codes where necessary and confirm a stable left-rear wheel-speed signal after installation.