Walker 250-21053 Oxygen Sensor - Upstream, Upstream Front or Upstream Rear

OE Oxygen Sensor for Toyota and Lexus

Walker Products OE 250-21053 is a specific-fit oxygen sensor engineered for upstream applications on select Toyota, Lexus, and Geo vehicles. It is built to deliver the ECU feedback needed for accurate fuel control and emissions monitoring on the listed applications.

Key Features

• Specific-fit oxygen sensor for upstream positions
• Non-heated design
• 10.35-inch wiring harness length
• 20-gauge wire with 1-wire configuration
• 18.0 mm thread diameter
• Flange mount design with radiused polygon male connector
• Overall length: 13.9 inches

Walker Products OE Line

Walker Products OE focuses on original-equipment-style replacement sensors for defined vehicle applications. Part number 250-21053 is matched to the correct fitment position and connector style so it can be used on the specified upstream oxygen sensor locations for Toyota Camry, Toyota Celica, Toyota Corolla, Lexus ES300, and Geo Prizm applications.

Detailed Description

This Walker Products oxygen sensor is intended for vehicles that require an upstream sensor with the listed connector, thread, and mounting specifications. It is used in emissions control systems to provide feedback to the ECU, helping the engine management system maintain proper air-fuel control and monitor catalyst-related performance on the covered applications. This part number 250-21053 is listed for 1992-1995 Toyota Camry, 1992-1995 Toyota Celica, 1993-1995 Toyota Corolla, 1992-1993 Lexus ES300, and 1993-1995 Geo Prizm in upstream positions.

This part cross-references Walker Products OE 250-21053 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate exhaust sensing
• Elevated exhaust emissions on the listed vehicles
• Fault codes stored in the ECU for upstream sensor circuits

Installation Notes and Tips

Verify the vehicle’s year, make, model, emissions configuration, and sensor position before ordering. Confirm the connector shape, thread diameter, and mounting style match the original sensor. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect signal quality.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures OE-style replacement sensors for defined applications. The brand is ISO 9001/TS 16949 certified, with production focused on application-specific fitment and ECU feedback requirements.