Walker 250-54089 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker Products OE Oxygen Sensor for Nissan and INFINITI

Walker Products OE Part Number 250-54089 is a heated oxygen sensor built for specific upstream applications. It is engineered as an OE-style replacement for vehicles that need accurate ECU feedback, including Nissan Cube, Nissan Sentra, and INFINITI FX50 fitments.

• Heated oxygen sensor with 4-wire design
• Specific fit for the listed upstream positions
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Wiring harness length: 15.87 in.; overall length: 19.41 in.
• Wire gauge: 20

OE-Style Sensor Feedback

Walker Products OE sensors are developed for direct replacement use in emission control systems where the ECU depends on precise oxygen sensor input. Part number 250-54089 is designed for upstream placement and is listed for California emissions and ESV applications across 2009-2014 Nissan and INFINITI models. If your Nissan Cube, Nissan Sentra, or INFINITI FX50 has a fault code tied to the upstream sensor circuit, this replacement is built to restore the expected diagnostic signal path.

This part cross-references no listed aftermarket part numbers in the provided data.

Vehicle Fitment

• Fits 2012-2014 Nissan Cube, upstream; compatible with California-ESV vehicles.
• Fits 2012-2014 Nissan Cube, upstream; California emissions ESV vehicles oxygen sensor.
• Fits 2009-2012 Nissan Sentra, upstream; compatible with California-ESV vehicles.
• Fits 2009-2012 Nissan Sentra, upstream; California emissions ESV vehicles oxygen sensor.
• Fits 2009-2012 INFINITI FX50, upstream right.
• Fits 2009-2012 INFINITI FX50, upstream left.
• Fits 2011 Nissan Cube, upstream; from 10/2010 (Calif-ESV), B1S1.

Common Issues This Sensor May Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from a degraded oxygen sensor
• Stored ECU fault codes tied to the sensor, wiring harness, or connector

Installation Notes

Confirm the upstream position, connector shape, and thread size before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect ECU feedback. Verify the vehicle’s emissions configuration, especially California-ESV applications, before ordering.

Quality Assurance

Walker Products has produced engine management and oxygen/air-fuel sensors since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The Walker Products OE line is built around application-specific replacement parts for emission control and engine management systems.