Shift Solenoid #2 for Subaru R4AX-EL 4EAT 1999-2004 31939-AA180

Shift Solenoid #2 for Subaru vehicles using the R4AX-EL / 4EAT automatic transmission. This solenoid uses a yellow electrical connector and is intended for applicable 1999–2004 transmission configurations.

Cross-references OEM part numbers 31939-AA180 and 31939-AA181. Verify the original solenoid, transmission identification, connector color, valve body position, and OEM reference before purchase. Vehicle make, model, and year alone are not sufficient to verify fitment.

Part Details

• Part Type: Automatic transmission Shift Solenoid #2

• Transmission Application: Subaru R4AX-EL / 4EAT

• Connector Color: Yellow

• Application Range: 1999–2004 transmission configurations

• OEM Reference Numbers: 31939-AA180, 31939-AA181

• Quantity: One shift solenoid

• Installation Location: Valve body, Shift Solenoid #2 position

Fitment Guidance

This solenoid is for Subaru applications equipped with the matching R4AX-EL / 4EAT transmission. OEM catalog results associate 31939-AA181 with Subaru Baja, Forester, Impreza, Legacy, Outback, and WRX applications, but specific year, engine, drivetrain, and transmission configuration must be verified before ordering.

Confirm all of the following before purchase:

• R4AX-EL or 4EAT transmission identification

• Yellow connector on the original Shift #2 solenoid

• Original OEM number 31939-AA180 or 31939-AA181

• Matching valve body location and electrical connector configuration

Service Information

Use this part when inspection and diagnostic testing identify a defective, sticking, or electrically out-of-specification Shift Solenoid #2. Potential transmission symptoms can include delayed shifts, harsh shifts, erratic shifting, shift flare, or related diagnostic trouble codes; however, these symptoms may also be caused by fluid condition, valve body wear, wiring damage, control-system faults, or internal transmission wear.

Have a qualified installer inspect the transmission harness, valve body, related solenoids, fluid condition, and internal components before installation. Refill the transmission with the manufacturer-specified ATF. Lubegard ATF Protectant may be used when compatible with the vehicle’s specified fluid and according to its directions.