Standard Ignition SC21 Vehicle Speed Sensor

Vehicle Speed Sensor for Pontiac LeMans

Standard Ignition SC21 is a trans-mounted vehicle speed sensor built for direct-fit service on 1988-1993 Pontiac LeMans applications. It uses a round female plug-in connector with a 3-pin male terminal layout for straightforward electrical connection and accurate transmission speed signal delivery.

For Pontiac LeMans owners searching for a vehicle speed sensor replacement, SC21 provides the connector style and mounting configuration needed for the listed application. Standard Ignition SC21 is engineered for consistent signal performance and long service life in everyday repair use.

Key Features

• Vehicle speed sensor for trans mount applications
• Round female connector with plug-in design
• 3-pin male terminal configuration
• Built for 1988-1993 Pontiac LeMans fitment
• Standard Ignition SC21 replacement part number

Detailed Description

Standard Ignition SC21 is a transmission-mounted vehicle speed sensor for 1988-1993 Pontiac LeMans models. The sensor’s round connector, female housing, and 3-pin male terminals support the electrical interface used in the listed application. Standard Ignition manufactures this sensor with controlled production processes from component assembly through final product inspection to help maintain consistent fit and signal output.

This part cross-references Dorman - HELP 31005 for the same application. If you are replacing a worn or failed Pontiac LeMans vehicle speed sensor, SC21 is a direct service part to match the original mounting and connector style.

Common Problems It Can Help Solve

• Inaccurate vehicle speed readings
• Intermittent speedometer operation
• Transmission control issues related to speed signal loss
• Diagnostic trouble codes tied to vehicle speed sensor performance
• Harsh or inconsistent shifting caused by missing speed input

Installation Notes and Tips

Verify the connector shape, terminal count, and trans mount location before installation. Compare the removed sensor to Standard Ignition SC21 to confirm the round plug-in connector and 3-pin terminal layout match the vehicle’s original configuration. Clean the mounting area and inspect the harness connector for corrosion or damaged terminals before connecting the new sensor.

Fits 1988-1993 Pontiac LeMans, trans mount.

Quality Assurance

Standard Ignition maintains manufacturing control from component sourcing through finished product assembly, supporting consistent quality for electrical and sensor replacement parts. SC21 is produced for precision performance, durability, and long service life in service applications.