Walker 250-25203 Oxygen Sensor - Upstream Left or Upstream Right

OE Base Wide-Band Oxygen Sensor

Walker OE Base Sensor 250-25203 is a specific-fit wide-band oxygen sensor for vehicles that need accurate exhaust feedback to the ECU. It is heated, uses a 6-wire layout, and is built with an oblong female connector, male blade terminals, and an M18 x 1.5 thread for the listed applications.

For drivers searching for a 2021-2024 Ram 1500 upstream right oxygen sensor or a 2021-2023 Dodge Challenger upstream left oxygen sensor, this Walker replacement is matched to the original sensor position and system requirements. The part number 250-25203 is also listed for 2021-2023 Dodge Charger upstream left applications.

Key Features

• Wide-band oxygen sensor for precise air-fuel feedback
• Heated design for faster operating temperature
• Specific-fit application for the listed vehicle positions
• 6-wire, 6-terminal configuration
• Oblong female connector with male blade terminals
• Standard replacement grade
• 22 mm wrench size and M18 x 1.5 thread size

Product Details

Walker Products OE Base Sensor line focuses on direct replacement engine management components built for application-specific fitment and diagnostic feedback. Part number 250-25203 is engineered for the exact sensor location and ECU input expected on the covered Ram and Dodge applications, helping maintain proper exhaust monitoring on vehicles equipped with wide-band oxygen sensing. Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified manufacturer.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the upstream left or upstream right location on the vehicle before installation, and verify thread and connector match the original sensor. For best results, clear stored fault codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker manufactures this OE Base Sensor as a standard replacement part for the listed applications, with fitment and diagnostic output aligned to the original vehicle requirements. The brand’s ISO-certified manufacturing process supports consistent sensor construction for modern engine management systems.