NTK AU0128 Automatic Transmission Speed Sensor - Input or Output

NTK Automatic Transmission Speed Sensor AU0128

The NTK AU0128 automatic transmission speed sensor is built for precise transmission speed signal monitoring in select Mazda applications. It uses a 3-terminal blade connection with a rectangular female connector to support a direct OE-style replacement for input and output sensor locations.

NTK’s technical sensor line draws on OE supplier experience and extensive testing, including thermal shock, vibration, and OBD verification. For Mazda 2, Mazda 3, Mazda 5, Mazda 6, and Protege applications, the AU0128 helps restore accurate transmission speed feedback when the original sensor is worn or failing.

Key Features

• Automatic transmission speed sensor for input and output applications
• 3-terminal blade design with 1 rectangular female connector
• Built to meet or exceed OE specifications
• OE-focused sensor coverage from NTK, The Sensor Specialist
• Direct replacement for select Mazda transmission applications

Product Details

The NTK Automatic Transmission Speed Sensor AU0128 is part of NTK’s technical sensor lineup, developed to streamline OE-style coverage under one brand. NTK leverages more than 80 years of automotive experience and OE supplier knowledge to produce sensors that are validated for demanding operating conditions. This part number is used across select Mazda transmission configurations, including Mazda 2, Mazda 3, Mazda 5, Mazda 6, Protege, and Protege5 models with input or output sensor positions as listed in the fitment data. This part cross-references Standard Ignition SC154 for the same application.

What It Helps Address

• Erratic or missing transmission speed signal
• Transmission shifting concerns related to speed sensor input
• Illuminated transmission or drivetrain warning lights tied to sensor faults
• Driveability issues caused by inaccurate input or output speed readings
• Failure from heat, vibration, or age-related sensor wear

Installation Notes

• Verify the sensor position before ordering; fitment includes input, output, and listed case-mounted locations.
• Confirm the connector style matches the vehicle harness: 3 terminals, blade terminals, rectangular female connector.
• Inspect the transmission connector and wiring for corrosion, damage, or fluid intrusion before installation.
• Use the vehicle-specific service procedure for access and removal on Mazda transmission cases and converter housing locations.
• Clear diagnostic codes and road test after installation to confirm proper signal operation.

Quality Assurance

NTK sensors are manufactured to meet or exceed OE specifications and are tested under thermal shock, vibration, and OBD verification conditions. The AU0128 reflects NTK’s OE application focus for Mazda transmission speed sensor service.