Walker 250-21029 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Saturn Upstream Applications

Walker Products OE oxygen sensor 250-21029 is a specific-fit replacement for upstream engine management applications on select Saturn models. Built for the correct location and ECU feedback requirements, it supports accurate air-fuel monitoring on vehicles such as the Saturn SC1, SC2, SL, SL1, SL2, SW1, and SW2.

Key Features

• Specific-fit upstream oxygen sensor for select Saturn applications
• Non-heated sensor design
• Threaded mounting type with 14.0 mm thread diameter
• Radiused polygon female connector
• 2.68 wiring harness length with 20-gauge wire
• Overall length: 6.22
• Walker Products OE line engineered as an OE-style replacement

Product Details

The Walker Products OE line focuses on application-specific engine management sensors built to match the required fitment position and diagnostic feedback expected by the ECU. Part number 250-21029 is an upstream oxygen sensor for select Saturn vehicles, including 1991-1994 Saturn SC1, 1993-1994 Saturn SC2, 1991-1994 Saturn SL and SL1, 1991-1993 Saturn SL2, 1993-1994 Saturn SW1, and 1993-1994 Saturn SW2. It also fits 1991-1992 Saturn SC and 1993 Saturn SW2 in upstream positions. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing sensor
• Higher exhaust emissions from inaccurate sensor readings
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle is a non-California emissions application where required by the fitment notes, especially for 1994 Saturn SC2, SL2, and SW2 listings. Verify the upstream position, connector shape, thread diameter, and harness routing before installation. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten sensor life and affect ECU feedback. For best results, compare the original sensor location and connector style before replacement.

Quality Assurance

Walker Products has produced engine management and oxygen/air-fuel sensors since 1946 and manufactures to ISO 9001/TS 16949 standards. The OE product line is built around application-specific fitment and diagnostic performance for modern engine control systems.