Walker 250-24023 Oxygen Sensor - Upstream

OE Oxygen Sensor for BMW 735i

Walker Products OE 250-24023 is a heated oxygen sensor built for specific vehicle fitment and ECU feedback requirements. It is listed for the upstream position on 1986-1987 BMW 735i models, making it a direct-match option for BMW 735i oxygen sensor replacement service.

Walker Products OE is the brand line focused on original-equipment-style engine management and oxygen/air-fuel sensors. The line is engineered around application-specific fitment, connector style, and sensor position so the ECU receives the correct signal for emissions and fuel control.

• Heated oxygen sensor for upstream placement
• Specific-fit design for 1986-1987 BMW 735i
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Male connector with radiused polygon shape
• Wiring harness length: 59.37 in.
• Overall length: 62.91 in.

Detailed Description

Walker Products OE 250-24023 is an oxygen sensor designed for the upstream location on the 1986-1987 BMW 735i. As a heated sensor, it helps the engine management system monitor exhaust oxygen content more quickly after startup, supporting accurate air-fuel control and emissions feedback. This part number is built for the specified application and position, which is important when replacing a BMW 735i upstream oxygen sensor or diagnosing sensor-related fault codes.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and the OE line is positioned around direct replacement fitment for specific vehicles. For this application, 250-24023 is the part number to reference when sourcing a BMW 735i upstream oxygen sensor replacement.

What It Helps Address

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

Installation Notes and Tips

Confirm the upstream location before installation and verify connector shape, wire count, and thread size against the removed sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. For BMW 735i oxygen sensor replacement, matching the threaded mount and harness routing to the original layout helps ensure proper installation.

Quality Assurance

Walker Products OE sensors are developed as original-equipment-style replacements for specific applications and are produced under an Automotive ISO9001/TS 16949 certified quality system. Part number 250-24023 is built to provide the diagnostic feedback expected by the ECU for the listed BMW 735i fitment.