Standard Ignition SC121 Automatic Transmission Output Shaft Speed Sensor

Automatic Transmission Output Shaft Speed Sensor for Jeep Cherokee

Standard Ignition SC121 is an automatic transmission output shaft speed sensor for 1998-2000 Jeep Cherokee applications. It is built with a female oval plug-in connector, a trans-mount design, and a 2-blade male terminal interface for direct replacement service.

Key Features

• Automatic transmission output shaft speed sensor
• Fits 1998-2000 Jeep Cherokee
• Female connector with oval plug-in design
• Trans mount location for transmission service applications
• 2 male blade terminals for electrical connection
• Standard Ignition SC121 replacement part number

Detailed Description

Standard Ignition SC121 is an output shaft speed sensor used in automatic transmission systems to monitor shaft speed and support transmission control operation. For Jeep Cherokee models from 1998 through 2000, this sensor matches the listed connector style, terminal layout, and mounting location for a straightforward OE-style replacement. This part cross-references Dorman OE Solutions 917-628 for the same application.

Standard Ignition manufactures this sensor with control over the production process from component materials through finished assembly. The brand’s sensor coverage is broad across domestic and import service needs, and its components are built for accurate signal performance and long service life. If you are replacing a failed Jeep Cherokee transmission speed sensor, SC121 provides a direct-fit service part for the listed vehicles.

What It Helps Fix

• Erratic or missing transmission speed signal
• Transmission shifting concerns related to shaft speed input
• Illuminated transmission or drivetrain warning indicators
• Harsh, delayed, or inconsistent shift behavior tied to sensor failure
• Diagnostic trouble codes associated with output shaft speed sensing

Installation Notes and Tips

Verify the connector shape, terminal count, and trans-mount location before installation. Compare the old sensor to Standard Ignition SC121 to confirm the oval female plug-in connector and 2-blade terminal layout match your vehicle. For 1998-2000 Jeep Cherokee service, clean the mounting area and inspect the harness connector for corrosion or damaged terminals before reconnecting.

Quality Assurance

Standard Ignition maintains manufacturing quality control throughout the production process, from componentry to finished product. The sensor is engineered for precision performance and durability to support dependable transmission service on the listed Jeep Cherokee applications.