Standard Ignition SC688 Vehicle Speed Sensor

Vehicle Speed Sensor for Subaru Applications

Standard Ignition SC688 is a vehicle speed sensor built for Subaru driveline and transmission monitoring needs. It uses a rectangular female plug-in connector with a 3-pin male terminal layout and bolt-mount installation on the transmission for a direct OE-style replacement.

Compatible With Subaru Crosstrek, Forester, Legacy, Outback, and Impreza applications listed below, this Standard Ignition SC688 speed sensor supports accurate transmission speed signal input and output sensing where equipped.

Key Features

• Vehicle speed sensor for transmission-mounted applications
• Rectangular female connector with plug-in connection
• Bolt-mount design for secure installation on the transmission
• 3-pin male terminal configuration
• Fits Subaru models with secondary, input sensor, or output sensor applications as listed
• Cross-references EXEDY OEM SC688 for the same application

Detailed Description

The Standard Ignition SC688 is a transmission-mounted vehicle speed sensor designed for Subaru vehicles that require a direct-fit electrical replacement. Its female connector, rectangular housing, and 3-terminal pin layout match the connection style used in the listed applications, helping maintain proper speed signal communication between the transmission and vehicle systems. This part number SC688 is listed for Subaru Crosstrek, Forester, Legacy, Outback, and Impreza fitments across 2012-2017 model years.

This sensor is used in applications where the transmission speed signal is needed for drivability and control functions. For buyers searching for a Subaru Forester vehicle speed sensor, Subaru Outback transmission speed sensor, or Subaru Impreza output sensor replacement, SC688 provides a fitment-specific option based on the vehicle and sensor position noted in the catalog data.

Fitment

• Fits 2016-2017 Subaru Crosstrek, Secondary.
• Fits 2017 Subaru Forester, Secondary.
• Fits 2014-2015 Subaru Forester, Secondary.
• Fits 2016 Subaru Forester, Secondary; Output Sensor.
• Fits 2016-2017 Subaru Legacy.
• Fits 2013-2015 Subaru Legacy, Secondary.
• Fits 2015-2017 Subaru Outback, Secondary.
• Fits 2013-2014 Subaru Outback, Input Sensor.
• Fits 2012-2016 Subaru Impreza, Secondary.

What It Helps Address

• Erratic or missing vehicle speed signal from the transmission
• Speedometer operation concerns tied to sensor signal loss
• Transmission control issues related to incorrect speed input
• Fault codes associated with vehicle speed sensor performance
• Replacement needs for a worn or damaged Subaru transmission speed sensor

Installation Notes and Tips

Install SC688 at the transmission mounting location using the bolt-mount design and verify the connector style, terminal count, and sensor position against the vehicle’s original part. Confirm whether the application calls for a secondary, input sensor, or output sensor before installation. For Subaru Crosstrek, Forester, Legacy, Outback, and Impreza fitments, match the catalog notes exactly to the vehicle configuration.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for electrical and engine management components. SC688 is cataloged as a direct replacement vehicle speed sensor with OE cross-reference coverage for the same application.