{"product_id":"standard-ignition-sc689-automatic-transmission-input-shaft-speed-sensor","title":"Standard Ignition SC689 Automatic Transmission Input Shaft Speed Sensor","description":"\u003ch2\u003eReliable Automatic Transmission Input Shaft Speed Sensor\u003c\/h2\u003e\u003cp\u003eThe Standard Ignition SC689 is designed to provide accurate input shaft speed readings for automatic transmissions in select Subaru models. This sensor helps maintain smooth shifting and optimal transmission performance for vehicles like the Subaru Crosstrek, Impreza, Legacy, Outback, and WRX.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Subaru Crosstrek, Impreza, Legacy, Outback, and WRX models\u003c\/li\u003e\n\u003cli\u003ePart number SC689 ensures precise fit and function\u003c\/li\u003e\n\u003cli\u003eMeasures input shaft speed for automatic transmissions\u003c\/li\u003e\n\u003cli\u003eDurable construction for consistent performance\u003c\/li\u003e\n\u003cli\u003eDirect replacement sensor for reliable operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Functionality\u003c\/h2\u003e\u003cp\u003eThe Standard Ignition SC689 automatic transmission input shaft speed sensor monitors the rotational speed of the transmission’s input shaft. This data is critical for the vehicle’s transmission control module (TCM) to regulate shift timing and torque converter lockup. Proper sensor function helps prevent transmission slippage, harsh shifting, and drivability issues. Designed specifically for Subaru models including the Crosstrek, Impreza, Legacy, Outback, and WRX, this sensor meets OEM specifications for fit and performance.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCorrects erratic or delayed gear shifting in automatic transmissions\u003c\/li\u003e\n\u003cli\u003eResolves transmission warning lights related to input speed sensor faults\u003c\/li\u003e\n\u003cli\u003ePrevents transmission slipping or failure to engage gears properly\u003c\/li\u003e\n\u003cli\u003eEliminates rough or harsh shifting symptoms\u003c\/li\u003e\n\u003cli\u003eHelps maintain fuel efficiency by ensuring proper transmission operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Standard Ignition SC689 sensor requires basic mechanical skills and proper tools. Before installation, verify compatibility with your Subaru model and transmission type. Disconnect the battery to prevent electrical shorts. Remove the old sensor carefully to avoid damage to the transmission housing. Clean the mounting area before installing the new sensor to ensure accurate readings. After installation, clear any diagnostic trouble codes and test drive the vehicle to confirm proper operation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eStandard Ignition parts are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The SC689 sensor undergoes rigorous quality control testing to provide consistent and accurate input shaft speed data. This part is backed by Standard Ignition’s limited warranty, covering defects in materials and workmanship under normal use conditions.\u003c\/p\u003e","brand":"Standard Ignition","offers":[{"title":"Default Title","offer_id":44704869679285,"sku":"FBHK-SC689","price":90.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/SI_SC689_Fro.jpg?v=1775094413","url":"https:\/\/www.partcatalog.com\/products\/standard-ignition-sc689-automatic-transmission-input-shaft-speed-sensor","provider":"PartCatalog","version":"1.0","type":"link"}