Delphi ES20161 Oxygen Sensor - Center, Rear, Rear Left or Rear Right

Delphi ES20161 Oxygen Sensor for Nissan and INFINITI

Delphi ES20161 is a heated oxygen sensor built for rear and center exhaust locations on select Nissan and INFINITI vehicles. It uses OE-based engineering from a supplier with long-standing original equipment experience, helping support accurate exhaust feedback in the applications listed below.

• Heated oxygen sensor for faster operating temperature and stable signal response
• 4-wire design with square connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 480.0
• Package contents: oxygen sensor and instruction sheet
• Position coverage includes center, rear, rear left, and rear right, depending on vehicle application

OE-Based Design and Fitment

This Delphi ES20161 oxygen sensor is engineered for direct replacement use on a wide range of Nissan and INFINITI models, including the Nissan Frontier, Pathfinder, Xterra, Maxima, Altima, Quest, 350Z, Sentra, and NV series, plus INFINITI FX35, FX45, G35, M35, M45, and Q45 applications. It is also listed for rear right, rear left, rear, and center positions where specified by the vehicle. This part cross-references Bosch 15518 and DENSO Auto Parts 234-4309 for the same application.

Common Symptoms This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the exhaust stream
• Reduced fuel control accuracy from a worn rear or center sensor
• Emission test failures tied to sensor response issues
• Slow or inconsistent sensor switching on heated applications

Installation Notes and Tips

Verify the exact position before ordering, since ES20161 is used in rear right, rear left, rear, and center locations depending on the vehicle. Confirm the 4-wire connector, square plug shape, and 18 x 1.5 mm thread size against the original sensor before installation. For best results, inspect the harness routing and exhaust threads, and follow the included instruction sheet during replacement.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and engineering knowledge developed through decades of original equipment supply to major automakers. That background is reflected in the design of ES20161 for consistent fit and function in the listed Nissan and INFINITI applications.