Walker 250-21019 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor 250-21019

Walker Products OE 250-21019 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Ford and Mazda applications. It is built for upstream placement and is designed to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Upstream sensor position for bank 1 sensor 1 and front sensor locations where listed
• Non-heated design with a threaded mounting type
• 18.0 mm thread diameter for application-specific fitment
• Radiused polygon female connector with 12.32 in. wiring harness length
• 20-gauge, 1-wire configuration
• Overall length: 15.87 in.

Detailed Description

The Walker Products OE 250-21019 oxygen sensor is built for vehicles that require an upstream sensor with the correct connector, wire length, and mounting style. This part is listed for 1988-1989 Ford Festiva, 1988 Mazda B2600, and 1984-1988 Mazda RX-7, making it a focused choice for owners searching for an upstream oxygen sensor for Ford Festiva or Mazda RX-7 applications. Walker Products OE emphasizes application-specific replacement parts, and this sensor follows that approach with fitment matched to the vehicle position and ECU feedback requirements.

Walker Products OE is the brand line used for original-equipment-style replacement components within Walker Products Engine Management. For buyers comparing Walker Products 250-21019 against other upstream oxygen sensor options, the key value is the specific-fit design rather than a universal configuration.

What It Helps Address

• Check engine or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust sensing
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle’s year, make, model, and upstream sensor position before ordering. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten service life and affect signal quality. For 1988-1989 Ford Festiva, 1988 Mazda B2600, and 1984-1988 Mazda RX-7 applications, verify that the connector shape, thread diameter, and harness length match the original sensor before installation.

Quality Assurance

Walker Products has been producing engine management and oxygen/air-fuel sensors since 1946 and operates as an ISO 9001/TS 16949 certified company. The 250-21019 is manufactured as an OE-style replacement with application-specific fitment and sensor feedback requirements in mind.