Walker 350-34888 Oxygen Sensor - Downstream or Downstream Right

Walker 350-34888 Oxygen Sensor Overview

Walker Products 350-34888 is a heated oxygen sensor built as a direct OE-style replacement for specific BMW applications. It is engineered for downstream placement and provides the ECU with the feedback needed to monitor exhaust performance and emissions control.

For BMW i3, M2, M3, X5, and other listed models, this Walker Products Aftermarket sensor is matched to the application, connector style, and mounting position for accurate fitment.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed BMW applications
• 4-wire configuration with 20-gauge wiring
• 18.50 in. wiring harness length and 21.65 in. overall length
• Threaded mount with 18.0 mm thread diameter
• Male connector with radiused polygon shape
• Walker Products part number 350-34888

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as OE replacement parts for a wide range of vehicles. Part number 350-34888 is built for specific fitment positions and is intended to deliver the diagnostic feedback the ECU expects from the downstream sensor location. The Walker Products Aftermarket line focuses on application-specific engine management components, and this sensor follows that approach with the correct connector, harness length, and threaded mounting design.

Fits 2021 BMW i3, downstream; Fits 2021 BMW i3s, downstream; Fits 2021 BMW M2, downstream right; Fits 2014-2020 BMW i3, downstream; Fits 2018-2020 BMW i3s, downstream; Fits 2019-2020 BMW M2, downstream right; Fits 2015-2020 BMW M4, downstream; Fits 2018-2019 BMW 640i Gran Coupe, downstream; Fits 2018-2019 BMW 640i xDrive Gran Coupe, downstream; Fits 2019 BMW X4, downstream; Fits 2017-2019 BMW X6, downstream; Fits 2018-2019 BMW X6, downstream; Fits 2018 BMW 640i, downstream; Fits 2018 BMW 640i xDrive, downstream; Fits 2016-2018 BMW M2, downstream; Fits 2015-2018 BMW M3, downstream; Fits 2016-2018 BMW X4, downstream; Fits 2016-2018 BMW X5, downstream; Fits 2017 BMW 535i GT, downstream; Fits 2017 BMW 535i GT xDrive, downstream; Fits 2014-2016 BMW 435i, downstream; Fits 2015-2016 BMW 435i Gran Coupe, downstream; Fits 2014-2016 BMW 435i xDrive, downstream; Fits 2015-2016 BMW 435i xDrive Gran Coupe, downstream; Fits 2014-2016 BMW ActiveHybrid 5, downstream; Fits 2014-2016 BMW i8, downstream; Fits 2014-2016 BMW M135i, downstream; Fits 2014-2016 BMW M235i, downstream; Fits 2015-2016 BMW M235i xDrive, downstream; Fits 2014-2015 BMW 335i, downstream; Fits 2014-2015 BMW 335i xDrive, downstream; Fits 2014-2015 BMW ActiveHybrid 3, downstream; Fits 2014-2015 BMW X5, downstream; Fits 2014 BMW 235i, downstream; Fits 2013 BMW M135i, downstream.

Common Issues This Sensor Can Address

• Stored oxygen sensor fault codes in the ECU
• Illuminated malfunction indicator light
• Poor engine operation related to exhaust feedback
• Increased fuel consumption from inaccurate sensor data
• Higher exhaust emissions caused by a failing downstream sensor

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion. Confirm the downstream position and connector style on the vehicle before installation, especially on BMW models with bank and sensor-specific applications such as Bank 1 Sensor 2 or Bank 2 Sensor 2. Threaded mounting and the specified harness length should be verified against the original part to ensure proper routing and fit.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. Part number 350-34888 is built as an OE replacement for the listed BMW applications and is backed by Walker Products’ application-specific manufacturing standards.