Walker 250-54135 Oxygen Sensor - Downstream Rear or Downstream Right

Walker OE Base Oxygen Sensor for Lexus

Walker OE Base Sensor 250-54135 is a heated wide-band oxygen sensor built for specific downstream applications. It is engineered as an OE-style replacement that delivers the diagnostic feedback the ECU expects, helping maintain accurate air-fuel control and emissions monitoring on select Lexus models.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• 4-wire, 4-terminal design
• M18 x 1.5 thread size
• Application-specific fitment for downstream right and downstream rear positions
• OE Base Sensor line from Walker Products

Detailed Description

Walker Products developed the OE Base Sensor line to match original equipment requirements for fitment position, connector application, and sensor output. Part number 250-54135 is designed for downstream oxygen sensor service on select Lexus LC500h, LS500, and LS500h models, where the ECU relies on accurate sensor feedback to monitor exhaust performance and emissions system operation. This part number 250-54135 is a direct-fit solution for vehicles that require a heated wide-band sensor with an M18 x 1.5 thread.

The OE Base Sensor product line focuses on application-specific replacement parts for modern engine management systems. For Lexus LC500h and Lexus LS500/LS500h applications, the sensor location matters, and this unit is built for the listed downstream right and downstream rear positions only. This helps ensure the replacement matches the original sensor’s role in the vehicle’s emissions control strategy.

What It Helps Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Elevated exhaust emissions from a failing downstream sensor
• Fault codes stored in the ECU for sensor or related system issues

Installation Notes and Tips

Before replacing the sensor, inspect the wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the vehicle position carefully, since this part is listed for downstream right and downstream rear applications only. Verify thread size and connector match before installation on Lexus LC500h, Lexus LS500, or Lexus LS500h models.

Quality Assurance

Walker Products has produced engine management and oxygen sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Base Sensor line is built around original-equipment replacement requirements for fit, function, and ECU feedback on the specified application.