Walker 350-34667 Oxygen Sensor - Downstream Front or Downstream Rear

OE Replacement Oxygen Sensor for Kia

Walker OE Replacement oxygen sensor 350-34667 is a specific-fit, heated narrow-band sensor built for direct replacement in select Kia applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible With 2019-2021 Kia Sedona, downstream rear and 2019-2020 Kia Cadenza, downstream front.

Key Features

• Heated narrow-band oxygen sensor for emissions and fuel-control feedback
• Specific-fit design for the listed Kia applications
• 4-wire configuration with blade terminals
• Square connector, male connector and terminal ends
• M18 x 1.5 threaded mounting for direct sensor replacement
• Overall length: 775 mm

Product Details

Walker Products develops engine management and oxygen/air-fuel sensors as OE-style replacements for a wide range of vehicles. Part 350-34667 is built for the correct application and mounting position, helping the ECU receive the diagnostic feedback it expects from the downstream sensor circuit. This matters on vehicles such as the Kia Sedona and Kia Cadenza, where the sensor supports emissions monitoring and closed-loop system performance.

The Walker OE Replacement line focuses on application-specific fitment rather than universal coverage. For this sensor, that means the connector style, thread size, wire count, and mounting format are matched to the vehicle position listed in the fitment data. If the original sensor has triggered a fault code, caused poor fuel economy, increased emissions, or illuminated the malfunction indicator light, replacing the worn sensor can restore proper signal output.

This part cross-references no listed aftermarket numbers for the same application.

Common Issues This Sensor May Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback affecting engine operation
• Higher fuel consumption from inaccurate sensor readings
• Increased exhaust emissions from a degraded sensor signal
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Before installation, inspect the sensor wiring harness, connector, and surrounding exhaust components for heat damage, corrosion, or physical wear. Confirm the mounting position and thread engagement match the vehicle application before tightening the sensor into the exhaust bung. Because this is a heated narrow-band sensor, proper connector alignment and secure wiring routing are important for reliable operation.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001 / TS 16949 certified company. Part 350-34667 is manufactured as an OE replacement sensor for the specified Kia fitments, with application-specific construction intended to meet the vehicle’s diagnostic and emissions feedback requirements.