Bosch 15726 Oxygen Sensor

Bosch Universal Oxygen Sensor 15726

Bosch SmartLink Universal Oxygen Sensor 15726 is built for direct air-fuel-ratio feedback in a wide range of import and domestic applications. It combines an OE-spec zirconia ceramic sensing element with a heated narrow-band design and a reusable Posi-Lock connector system for a clean, professional installation.

For Nissan Frontier, Nissan Xterra, Infiniti QX4, and other listed applications, this Bosch oxygen sensor is designed to restore accurate exhaust monitoring without requiring soldering or specialty tools. The extended lead length adds flexibility when the original harness is damaged, shortened, or difficult to reach.

Key Features

• Universal narrow-band heated oxygen sensor for standard replacement use
• OE-spec zirconia ceramic element and heater design
• SmartLink Posi-Lock connector system for secure electrical connections
• Reusable connector design for adjustments during installation
• Extended harness length for added routing flexibility
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included

Product Details

Bosch 15726 is part of the Universal Oxygen Sensor line, a Bosch product line focused on adapting OE-quality sensor technology to a broader range of vehicles. The SmartLink connector approach is intended to simplify replacement on vehicles where the original connector or lead length creates installation challenges. This makes it a practical choice for service work on Nissan Pathfinder, Infiniti I30, Subaru Legacy, Mazda 626, and similar applications listed in the fitment data.

This part cross-references Bosch 15726 for the same application.

What It Helps Solve

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel-ratio feedback to the engine control module
• Hard-to-match factory connector issues during sensor replacement
• Damaged, shortened, or difficult-to-route sensor wiring
• Slow or inconsistent sensor response from a worn narrow-band O2 sensor

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream, downstream, upstream left, upstream right, and upstream rear locations depending on the vehicle. Use the threaded mounting and 18 mm thread size to confirm exhaust bung compatibility, and match the connector layout to the existing harness before final assembly. The Posi-Lock connector system is designed for fast adaptation without soldering or crimping.

Fitment examples include 1998-2004 Nissan Frontier, upstream; 2000-2004 Nissan Xterra, upstream; and 1997-2000 Infiniti QX4, upstream left. Additional coverage includes many Nissan, Infiniti, Subaru, Mazda, Chevrolet, GMC, Ford, and other listed vehicles across the 1984-2004 model years.

Quality Assurance

Bosch builds this universal oxygen sensor with the same core sensing and heater design used in OE applications, supporting dependable exhaust feedback and consistent operation across the listed fitments. The connector system is engineered for high-temperature and weather-resistant electrical connections.