Walker 250-22009 Oxygen Sensor - Downstream

OE Oxygen Sensor for Lexus LS400

Walker Products OE 250-22009 is a specific-fit, non-heated oxygen sensor built for downstream placement on select Lexus LS400 applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

Fits 1990-1992 Lexus LS400, downstream. This Walker Products OE oxygen sensor is built for the vehicle’s specified mounting position and diagnostic requirements.

Key Features

• Specific-fit oxygen sensor for downstream installation
• Non-heated sensor design
• 2-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• 15.28 in. wiring harness length and 18.82 in. overall length

Product Details

Walker Products OE 250-22009 is part of the Walker Products OE line, which focuses on original-equipment-style replacement sensors for defined vehicle applications. For 1990-1992 Lexus LS400 models, this downstream oxygen sensor is matched to the correct position and connector style so the engine management system can receive the exhaust signal it expects. The part number 250-22009 is also a useful reference when verifying the correct sensor for service work on the Lexus LS400.

Walker Products has long supplied engine management and oxygen/air-fuel sensors for vehicle-specific replacement needs, with manufacturing processes aligned to automotive quality standards. The 250-22009 oxygen sensor is built around the application details rather than a universal design, which helps ensure proper fitment on the listed Lexus LS400 vehicles. If you are replacing a downstream oxygen sensor on a 1990-1992 Lexus LS400, 250-22009 is the OE-style part to check against the original sensor configuration.

What It Helps Address

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

Installation Notes

Confirm downstream placement before installation and compare the connector, thread diameter, and harness length to the original sensor. Inspect the sensor wiring, connector, and nearby harness for heat damage, corrosion, or physical wear before replacement. Because this is a specific-fit sensor, verify the vehicle year and model against the listed Lexus LS400 applications and the original part configuration.

Quality Assurance

Walker Products OE sensors are developed as OE-style replacements for defined applications and manufactured under automotive quality management practices. The brand’s focus on application-specific fitment supports accurate ECU feedback on the listed vehicles.