Walker 350-34638 Oxygen Sensor

Walker 350-34638 Oxygen Sensor for Land Rover

Walker Products 350-34638 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Land Rover Discovery, Range Rover, and Defender 90 applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34638 follows that approach with the correct mounting style, connector design, and wiring configuration for the listed Land Rover positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the listed Land Rover upstream and downstream positions
• 4-wire design with 20-gauge wiring
• Threaded mounting with 12.0 mm thread diameter
• Radiused polygon male connector for application-matched connection
• Overall length: 21.97 in.; wiring harness length: 18.43 in.

Detailed Description

This Walker oxygen sensor, part number 350-34638, is designed for Land Rover emissions control systems that rely on accurate exhaust-gas feedback. It is compatible with 1994-1999 Land Rover Defender 90, 1996-1999 Land Rover Discovery, and 1997-1998 Land Rover Range Rover applications in the specified upstream and downstream positions. For Land Rover Discovery oxygen sensor replacement, Range Rover oxygen sensor service, or Defender 90 upstream sensor repair, this part provides the correct fitment details for the ECU and harness connection.

As an OE-replacement style sensor, it is intended to restore proper signal input when the original sensor has aged, been damaged, or is no longer reporting accurately. The result can be improved drivability, more stable fuel delivery, and reduced emissions-related fault activity when the rest of the system is in good condition.

What It May Help Resolve

• Check engine light or MIL illumination tied to oxygen sensor faults
• Poor engine performance caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel correction
• Elevated exhaust emissions from a failing heated oxygen sensor
• Stored ECU fault codes related to the affected sensor circuit

Installation Notes and Tips

Confirm the exact position before ordering: upstream right, upstream left, downstream right, or downstream left, depending on the vehicle and chassis breakpoints listed. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Because this is a threaded sensor, verify thread diameter and connector shape against the original part to ensure proper installation on the Land Rover Discovery, Range Rover, or Defender 90 application.

For best results, clear any stored diagnostic trouble codes after installation and verify that the engine management system returns to normal closed-loop operation.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. Part number 350-34638 is built for specific application fitment and ECU feedback requirements, supporting consistent replacement quality for the listed Land Rover vehicles.