Walker 250-21027 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Vanagon

Walker Products OE 250-21027 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Volkswagen applications. It is built for upstream placement and uses a threaded mount with a female radiused-polygon connector for direct application matching on the vehicle.

For 1984-1985 Volkswagen Vanagon models, this upstream oxygen sensor helps the ECU receive the exhaust feedback it needs for proper fuel control. The Walker Products OE line focuses on application-specific fitment and diagnostic signal accuracy, making 250-21027 a practical choice when replacing a worn sensor on a Volkswagen Vanagon, upstream.

Key Features

• Part number: 250-21027
• Specific-fit oxygen sensor for select Volkswagen applications
• Upstream position
• Non-heated sensor design
• Threaded mounting type with 18.0 mm thread diameter
• 28.27 in. wiring harness length
• 20-gauge, 1-wire configuration
• Female radiused-polygon connector
• Overall length: 31.81 in.

Detailed Description

Walker Products OE 250-21027 is part of the Walker Products OE sensor line, which is built around application-specific replacement coverage for engine management systems. This oxygen sensor is designed for upstream use and is matched to the vehicle’s fitment position so the ECU can receive the exhaust feedback required for fuel-control operation. For Volkswagen Vanagon owners, the 250-21027 provides a direct-fit replacement option for 1984-1985 models listed in the fitment data.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946 and manufactures to automotive quality standards, including ISO 9001/TS 16949 certification. If your Volkswagen Vanagon is showing drivability concerns tied to oxygen sensor performance, this part number is the OE-style replacement to reference: 250-21027.

What It Helps Address

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

Installation Notes

Verify the sensor location before installation: this part is for upstream use on the listed Volkswagen Vanagon applications. Inspect the sensor, wiring harness, and connector for physical damage before replacement, since damaged wiring or connectors can shorten sensor life and affect signal quality. Confirm thread size, connector style, and harness routing against the original part before installation.

Quality Assurance

Walker Products OE 250-21027 is manufactured as an OE replacement sensor for the specified application and position. The Walker Products OE line is backed by the company’s long-running focus on engine management components and automotive quality systems.