Walker 350-341115 Oxygen Sensor - Downstream

Walker OE Replacement Oxygen Sensor for Honda Civic

Walker OE Replacement oxygen sensor part number 350-341115 is a direct-fit, downstream narrow-band sensor for select Honda Civic applications. It is engineered for the specified mounting position and ECU feedback requirements, helping maintain accurate exhaust monitoring on the vehicle.

Key Features

• Specific-fit downstream oxygen sensor for select Honda Civic models
• Heated narrow-band design for standard replacement use
• 4-wire configuration with square connector and male terminals
• M18 x 1.5 threaded mounting with 22 mm wrench size
• 375 mm wiring harness length and 408 mm overall length
• Walker OE Replacement line built for application-specific fitment

Product Details

Walker Products 350-341115 is part of the OE Replacement line, which focuses on application-specific engine management and oxygen sensor coverage. This downstream sensor is built for 2025 Honda Civic, 2020-2021 Honda Civic, and 2017-2019 Honda Civic applications, including B1S2 coverage on the 2017-2019 models. As a heated narrow-band oxygen sensor, it is designed to provide the ECU with the exhaust feedback needed for proper system monitoring on the Honda Civic.

This part number, 350-341115, is intended for direct replacement use where the original sensor uses a threaded M18 x 1.5 mount, square connector, and 4-wire layout. Walker Products has supplied engine management and sensor components since 1946 and manufactures application-specific parts for defined vehicle positions.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect exhaust feedback to the ECU
• Poor fuel economy caused by a failing sensor
• Rough engine operation tied to sensor signal issues
• Elevated exhaust emissions from degraded sensor response

Installation Notes

Before replacement, inspect the sensor wiring harness, connector, and surrounding exhaust components for heat damage or corrosion. Confirm the downstream mounting position and connector style on the Honda Civic before installation. Use the correct 22 mm wrench size and verify the threaded M18 x 1.5 fitment matches the original sensor location.

Quality Assurance

Walker Products manufactures this OE Replacement sensor as an application-specific part for the listed Honda Civic fitments. The brand’s sensor programs are built around defined vehicle positions and ECU feedback requirements for consistent replacement use.