Walker 250-23066 Oxygen Sensor - Upstream

Walker OE Oxygen Sensor for Mercedes-Benz 190E

Walker Products OE 250-23066 is a heated oxygen sensor built for specific fitment and upstream placement. It is engineered to provide the ECU with the feedback needed for proper fuel control on 1991-1993 Mercedes-Benz 190E applications.

For Mercedes-Benz 190E owners diagnosing a check engine light, poor fuel economy, or elevated emissions, this Walker oxygen sensor offers an OE-style replacement matched to the vehicle’s upstream sensor location. The Walker Products OE line focuses on application-specific engine management components for direct-fit service.

Key Features

• Part number: 250-23066
• Heated oxygen sensor for faster operating response
• Specific fitment for upstream installation
• 3-wire design with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting type with 18.00 mm thread diameter
• Overall length: 21.77 in.; wiring harness length: 18.23 in.

Detailed Description

Walker Products OE 250-23066 is an upstream oxygen sensor for 1991-1993 Mercedes-Benz 190E models. It is designed to replace the original sensor in the bank 1 sensor 1 position and deliver the diagnostic feedback the ECU uses to manage air-fuel ratio. The Walker Products OE line is built around application-specific fitment, making this part a direct-match option for Mercedes-Benz 190E oxygen sensor replacement service.

This part cross-references no listed aftermarket part numbers in the provided data. If you are searching for a Mercedes-Benz 190E upstream oxygen sensor, Walker Products OE 250-23066 is the exact part number to reference for this application.

What It Helps Address

• Check engine light related to the upstream oxygen sensor
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel data
• Higher exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Verify the sensor location before installation: this part is for the upstream position on 1991-1993 Mercedes-Benz 190E, including bank 1 sensor 1 applications. Inspect the sensor wiring harness and connector for damage before replacement, since physical wear can shorten sensor life and affect operation. Confirm thread size, connector style, and harness length against the original part before installation.

Quality Assurance

Walker Products OE sensors are developed as original-equipment replacement parts for specific vehicle applications. Walker Products has operated in engine management and fuel system components since 1946 and is an ISO 9001/TS 16949 certified company.