Walker 350-34624 Oxygen Sensor - Upstream

Walker 350-34624 Oxygen Sensor for BMW 525i

Walker Products 350-34624 is a heated oxygen sensor built as a specific-fit OE-style replacement for select BMW applications. It is engineered for upstream placement and provides the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible with 1993-1995 BMW 525i upstream and 1993 BMW 525iT upstream, this sensor is a direct-fit option for drivers addressing oxygen sensor fault codes, drivability concerns, or emissions-related warning lights.

Key Features

• Part number: 350-34624
• Heated oxygen sensor design
• Specific fit for the listed BMW applications
• Upstream mounting position
• 4-wire configuration with female connector
• Threaded mount with 18.0 mm thread diameter
• Wiring harness length: 53.66
• Overall length: 57.2

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE replacement use. The 350-34624 is built for the correct application and fitment position so the vehicle’s ECU receives the expected diagnostic signal. For BMW 525i and BMW 525iT models, an upstream oxygen sensor plays a direct role in air-fuel mixture control and emissions feedback.

This part number, 350-34624, is intended for specific BMW fitment rather than universal use. The radiused polygon connector shape, 20-gauge wiring, and threaded mounting design support a direct replacement installation on the listed vehicles.

Common Issues Addressed

• Check engine light related to oxygen sensor performance
• Poor fuel economy from incorrect air-fuel feedback
• Rough running or hesitation caused by faulty sensor input
• Elevated exhaust emissions
• Stored ECU fault codes tied to the upstream sensor circuit

Installation Notes

Install in the upstream oxygen sensor location only on the listed BMW applications. Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect signal quality. Verify connector shape, thread diameter, and harness routing against the original part before installation.

Fits 1993-1995 BMW 525i, upstream. Fits 1993 BMW 525iT, upstream. This part cross-references Walker Products Aftermarket 350-34624 for the same application.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified manufacturer with a long history in engine management and fuel system components. The 350-34624 is produced as an application-specific replacement sensor for the listed BMW fitments.