Walker 250-21025 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Cadillac

Walker Products OE Part Number 250-21025 is a specific-fit, non-heated oxygen sensor for select 1979-1980 Cadillac Eldorado and Cadillac Seville upstream applications. It is engineered to provide the ECU with the diagnostic feedback needed for proper engine management on the listed vehicles.

Key Features

• Specific-fit oxygen sensor for the listed Cadillac applications
• Non-heated sensor design
• Upstream mounting position
• Threaded installation with 18.0 mm thread diameter
• Radiused polygon male connector
• 4.45 wiring harness length with 20-gauge wire
• Overall length: 7.99

Product Details

Walker Products OE 250-21025 is built as an OE-style replacement oxygen sensor for vehicles that rely on accurate exhaust feedback to manage fuel delivery and emissions. For 1979-1980 Cadillac Eldorado and 1979-1980 Cadillac Seville upstream locations, this sensor is matched to the application, fitment position, and connector style required for proper system communication. Walker Products OE focuses on engine management sensors developed for direct replacement use, and this part number follows that approach for the specified Cadillac models.

Fits 1979-1980 Cadillac Eldorado, upstream. Fits 1979-1980 Cadillac Seville, upstream. Part number 250-21025 is the correct reference when searching for a Walker Products OE oxygen sensor for these Cadillac applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel information
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes and Tips

Confirm the upstream location before ordering or installing. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals, since physical damage can shorten service life and affect signal quality. Verify the 18.0 mm threaded mounting point and connector shape match the original unit on the vehicle. For best results, compare the removed sensor to Walker Products OE 250-21025 before installation.

Quality Assurance

Walker Products has produced engine management and oxygen/air-fuel sensors for OE replacement use since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The Walker Products OE line is built around application-specific fitment and ECU feedback requirements for the listed vehicles.