Standard Ignition SC686 Vehicle Speed Sensor

Vehicle Speed Sensor for Subaru Applications

Standard Ignition SC686 is a vehicle speed sensor built for direct replacement on select Subaru models. It uses a female rectangular plug-in connector with a 3-pin male terminal layout and bolt-mount installation on the transmission.

Compatible With Subaru Tribeca, Legacy, Impreza, and Forester applications across the listed model years, this SC686 speed sensor supports accurate transmission speed signal input for drivability and shifting performance.

Key Features

• Vehicle speed sensor for transmission-mounted applications
• Female connector with rectangular plug-in design
• 3-pin male terminal configuration
• Bolt-mount installation location on the transmission
• Direct-fit replacement for select Subaru vehicles

Detailed Description

Standard Ignition SC686 is a transmission-mounted vehicle speed sensor engineered for Subaru fitments that require a rectangular, plug-in electrical connection. It is listed for 2008-2014 Subaru Tribeca, 2010-2012 Subaru Legacy, 2005-2011 Subaru Impreza without harness, 2005-2010 Subaru Forester without harness, and 2005-2009 Subaru Legacy without harness. The SC686 part number is also referenced by interchange numbers used for the same application, including 31937AA071 and SN8388.

For buyers searching for a Subaru Forester vehicle speed sensor, Subaru Impreza speed sensor, or Subaru Legacy transmission speed sensor, Standard Ignition SC686 provides the specified connector and mounting style needed for the listed vehicles. It is a practical replacement when the original sensor has failed or the transmission speed signal is no longer being read correctly.

Common Reasons to Replace

• Erratic or incorrect speedometer readings
• Transmission shifting concerns related to vehicle speed input
• Diagnostic trouble codes tied to speed sensor performance
• Loss of speed signal from the transmission
• Electrical connector or sensor failure at the transmission

Installation Notes and Tips

Install SC686 on the transmission using the bolt-mount location specified for the application. Confirm the connector style, terminal count, and harness configuration before installation, especially on Subaru Impreza, Forester, and Legacy models listed without harness. Verify the original sensor part number and connector orientation before final assembly.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for electrical and engine management components. SC686 is cataloged as a direct replacement vehicle speed sensor for the listed Subaru applications and cross-references OE and aftermarket numbers used for the same fitment.