Walker 350-34716 Oxygen Sensor - Upstream

Walker 350-34716 Oxygen Sensor for BMW 318i

Walker Products 350-34716 is a heated oxygen sensor built as a specific-fit OE-style replacement for the upstream position on select 1991 BMW 318i applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment. For BMW 318i owners, that means a sensor matched to the vehicle position, connector style, and signal requirements rather than a universal part.

Key Features

• Part number: 350-34716
• Heated oxygen sensor for faster operating response
• Specific fit for the upstream location
• 4-wire design with female connector
• 18.00 mm thread diameter
• 34.37 in. wiring harness length
• 37.91 in. overall length
• 20-gauge wire construction

Detailed Description

This Walker oxygen sensor is built for 1991 BMW 318i upstream service, including Bank 1 Sensor 1 applications. It is intended to restore accurate exhaust feedback to the engine control unit so the system can manage air-fuel delivery and monitor emissions performance. The heated design helps the sensor reach operating temperature more quickly, which supports consistent signal output during normal driving.

Walker Products has long supplied engine management components for OE replacement use, and the 350-34716 follows that approach with application-specific fitment. If your BMW 318i has an upstream sensor fault, this part number 350-34716 is the direct replacement to verify against the original sensor configuration.

What It Helps Address

• Check engine light related to upstream 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 sensor
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes and Tips

Before installation, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the upstream position on the BMW 318i and match the thread diameter, connector gender, wire count, and harness length to the original part. If the old sensor failed from wiring damage, repair the circuit before installing the replacement.

For fitment verification, use the vehicle’s original sensor location and connector layout. Fits 1991 BMW 318i, upstream. Fits 1991 BMW 318i, front oxygen sensor position.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components for specific applications and positions. The 350-34716 is built to deliver the diagnostic feedback expected by the ECU on the listed BMW 318i fitment.