HomeElectrical, Lighting and Body > SensorsStandard Ignition SC688 Vehicle Speed Sensor
Part #: SC688

Standard Ignition SC688 Vehicle Speed Sensor

21 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Subaru, Crosstrek, Forester, Impreza, Legacy, and Outback
Easy Returns — Return within 60 days for a full refund
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Reliable Vehicle Speed Sensor for Subaru Models

The Standard Ignition SC688 Vehicle Speed Sensor is designed to provide accurate speed data for your Subaru Crosstrek, Forester, Impreza, Legacy, or Outback. Engineered for precise fitment and dependable performance, this sensor ensures your vehicle's transmission system operates smoothly.

  • Connector Gender: Female
  • Single rectangular plug-in connector
  • Bolt mount installation on transmission
  • Three male pin terminals for secure electrical connection
  • Compatible with multiple Subaru models including Crosstrek, Forester, Impreza, Legacy, and Outback

Detailed Product Features and Specifications

The SC688 Vehicle Speed Sensor from Standard Ignition features a female connector with a rectangular shape designed for a plug-in connection, ensuring a secure and reliable interface with your vehicle's wiring harness. It mounts directly onto the transmission using a bolt mount type, providing a stable and precise installation point. The sensor includes three male pin terminals, which facilitate accurate signal transmission to the vehicle's electronic control systems. This sensor is specifically engineered for Subaru vehicles, including the Crosstrek, Forester, Impreza, Legacy, and Outback models, ensuring compatibility and optimal performance.

Common Applications and Problem Resolution

  • Restores accurate vehicle speed readings for dashboard and ABS systems
  • Resolves erratic speedometer behavior or failure
  • Eliminates transmission shifting issues related to faulty speed data
  • Prevents check engine light triggers caused by speed sensor faults
  • Improves overall drivability and transmission response

Installation Notes and Tips

When installing the Standard Ignition SC688 Vehicle Speed Sensor, ensure the bolt mount location on the transmission is clean and free of debris. Carefully align the rectangular female connector with the vehicle’s wiring harness plug to avoid damage to the terminals. Tighten mounting bolts securely to prevent sensor movement, which could affect signal accuracy. It is recommended to verify sensor operation after installation by checking vehicle speed readings and transmission behavior.

Quality Assurance and Warranty Information

Standard Ignition parts are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. The SC688 Vehicle Speed Sensor undergoes rigorous quality control testing to ensure consistent operation. Please refer to Standard Ignition’s warranty policy for specific coverage details related to this part number.

BrandStandard Ignition
Part NumberSC688
Connector GenderFemale
Connector Quantity1
Connector ShapeRectangular
Connector TypePlug in
Mounting LocationOn transimission
Mounting TypeBolt mount
Terminal GenderMale
Terminal Quantity3
Terminal TypePin

This part fits 21 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2017SubaruCrosstrekN/ASecondary
2017SubaruForesterN/ASecondary
2017SubaruLegacy2.5LH4N/A
2017SubaruOutback2.5LH4N/ASecondary
2016SubaruCrosstrekN/ASecondary
2016SubaruForesterN/ASecondary; Output Sensor
2016SubaruImprezaN/ASecondary
2016SubaruLegacy2.5LH4N/A
2016SubaruOutbackN/ASecondary
2015SubaruForesterN/ASecondary
2015SubaruImprezaN/ASecondary
2015SubaruLegacyN/ASecondary
2015SubaruOutback2.5LH4N/ASecondary
2014SubaruForesterN/ASecondary
2014SubaruImprezaN/ASecondary
2014SubaruLegacyN/ASecondary
2014SubaruOutback2.5LH4N/AInput Sensor
2013SubaruImprezaN/ASecondary
2013SubaruLegacyN/ASecondary
2013SubaruOutback2.5LH4N/AInput Sensor
2012SubaruImprezaN/ASecondary

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

31937AA170SC688SN8390VSS1222VSSA226

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.