Walker 250-25155 Oxygen Sensor - Upstream or Upstream Right

OE Oxygen Sensor for Select GM Applications

Walker Products OE oxygen sensor Part Number 250-25155 is an Original Equipment-style replacement built for specific vehicle applications and sensor locations. It is designed to provide the ECU with the diagnostic feedback needed for proper engine management on select Buick, Cadillac, and Chevrolet models.

Compatible With 2020-2024 Buick Encore GX, upstream; 2024 Buick Envista, upstream; 2022-2024 Cadillac CT5, upstream right; 2021-2024 Chevrolet Trailblazer, upstream; and 2024 Chevrolet Trax, upstream.

Key Features

• OE replacement oxygen sensor for application-specific fitment
• Built for upstream and upstream right sensor positions
• Supports ECU feedback for air-fuel and emissions monitoring
• Designed for select Buick, Cadillac, and Chevrolet vehicles
• Walker Products OE line focused on engine management sensors
• Part Number 250-25155 for catalog and service matching

Product Details

Walker Products OE 250-25155 is engineered for the exact application and mounting position listed in the fitment data. As an oxygen sensor, it helps the engine control module monitor exhaust oxygen content so the vehicle can adjust fuel delivery and emissions strategy. This part is a direct-fit style replacement for select 2020-2024 Buick Encore GX, 2024 Buick Envista, 2022-2024 Cadillac CT5, 2021-2024 Chevrolet Trailblazer, and 2024 Chevrolet Trax models.

The Walker Products OE line is positioned as an OE replacement program for engine management and oxygen/air-fuel sensors. Part Number 250-25155 is intended for buyers searching for a 2024 Chevrolet Trax upstream oxygen sensor, a 2022-2024 Cadillac CT5 upstream right oxygen sensor, or a 2020-2024 Buick Encore GX upstream oxygen sensor.

What It May Help Resolve

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel correction
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream and upstream right locations only. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation. Confirm the vehicle year, make, model, and engine management configuration against the fitment data to ensure the correct application.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under ISO 9001/TS 16949 quality systems. Since 1946, the brand has supplied oxygen and air-fuel sensors for vehicle service applications.