Walker 350-34257 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Mercedes-Benz SL320

Walker Products 350-34257 is a heated oxygen sensor built as a specific-fit OE replacement for the 1996 Mercedes-Benz SL320 upstream position. It is engineered to provide the ECU with the feedback needed for fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-34257 follows that approach with a threaded, 4-wire design and a radiused polygon male connector for the listed vehicle application.

Key Features

• Specific-fit oxygen sensor for the upstream location
• Heated sensor design for faster operating temperature
• 4-wire configuration with 20-gauge wiring
• 8.39 in. wiring harness length
• 18.0 mm thread diameter with threaded mounting
• Overall length: 11.93 in.
• Radiused polygon connector shape, male terminal

Detailed Description

The Walker 350-34257 oxygen sensor is designed for the 1996 Mercedes-Benz SL320 upstream exhaust position, where it helps the engine control module monitor exhaust oxygen content and adjust air-fuel delivery. For Mercedes-Benz SL320 owners searching for an upstream oxygen sensor replacement, this part number provides the correct fitment and sensor configuration for the listed application. The heated design supports quicker sensor response after startup, which is important for drivability, emissions control, and closed-loop operation. Walker Products 350-34257 is also a relevant search match for buyers looking for a 1996 Mercedes-Benz SL320 upstream oxygen sensor or Walker 350-34257 replacement sensor.

Walker Products Aftermarket develops engine management sensors as OE-style replacements for many vehicles worldwide, with application-specific fitment and connector design. This part cross-references Bosch (e.g., 15733) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough running or inconsistent air-fuel control
• Higher exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the oxygen sensor circuit

Installation Notes and Tips

• Fits 1996 Mercedes-Benz SL320, upstream.
• Confirm the connector shape, wire count, and thread diameter before installation.
• Inspect the sensor wiring harness and connector for heat damage or corrosion.
• Check the exhaust bung threads and mounting surface for wear before threading in the sensor.
• Clear diagnostic trouble codes after installation and verify proper ECU feedback.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management and fuel system components. The 350-34257 is built for the specified application and fitment position to support proper diagnostic feedback to the ECU.