Walker 250-25160 Oxygen Sensor - Upstream, Upstream Rear or Upstream Right

Walker OE Base Oxygen Sensor

Walker OE Base Sensor 250-25160 is a heated wide-band oxygen sensor built for specific vehicle applications and exact fitment positions. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring on select Nissan, Infiniti, Cadillac, and related applications.

The Walker OE Base Sensor line focuses on application-specific replacement parts, with the connector, wiring, and sensor configuration matched to the vehicle position. Part number 250-25160 is a direct-fit oxygen sensor for upstream right, upstream rear, and upstream locations where listed.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed vehicle applications
• 5-wire sensor layout with 6-terminal female connector
• Rectangle connector shape with male terminals
• M18 x 1.5 thread size and 22 mm wrench size
• OE Base Sensor line for application-matched replacement use

Detailed Description

Walker 250-25160 is an emission control sensor designed to replace the original oxygen sensor on select Infiniti M45, FX45, Q45, QX56, Nissan Quest, Maxima, Murano, Altima, Armada, Frontier, Pathfinder, Titan, Xterra, Sentra, and Cadillac SRX, CTS, and STS applications. This sensor is listed for upstream right, upstream rear, and upstream positions depending on the vehicle and model year. For buyers searching for a 2004 Nissan Murano upstream rear oxygen sensor, a 2005-2006 Nissan Armada upstream right oxygen sensor, or a 2006 Infiniti FX45 upstream right sensor, this part number provides the specified OE-style replacement.

The OE Base Sensor product line is built around exact application fitment and diagnostic feedback requirements. When an oxygen sensor begins to fail, the vehicle may run poorly, use more fuel, increase exhaust emissions, or trigger the malfunction indicator light. Part number 250-25160 is intended for those listed applications where the original sensor uses the same connector style, thread size, and wire configuration.

What It Helps Address

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

Installation Notes and Tips

Verify the connector shape, terminal count, wire quantity, and sensor position before installation. This part uses a 22 mm wrench size and M18 x 1.5 thread size. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before replacing the sensor. Confirm the vehicle’s exact year, make, model, and position match the fitment listing for Walker 250-25160.

Quality Assurance

Walker Products has been manufacturing engine management and oxygen sensor components since 1946 and operates as an ISO 9001 / TS 16949 certified company. The OE Base Sensor line is developed as an original-equipment replacement solution for listed applications, with fitment-specific engineering and diagnostic feedback requirements in mind.