Bosch 15525 Oxygen Sensor

Bosch Oxygen Sensor for Nissan and Infiniti

Bosch Engineered Oxygen Sensor 15525 is a specific-fit, narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management across changing operating conditions, making it a direct replacement choice for select Nissan and INFINITI applications.

Built with a threaded 18 mm mounting design, 4-wire blade terminals, and an included wiring harness, this Bosch oxygen sensor is made for dependable signal delivery and consistent heater performance. The Bosch Engineered Oxygen Sensor line draws on Bosch OE development and narrowband sensor design improvements for faster closed-loop operation and accurate lambda control.

Key Features

• Bosch part number 15525 for select Nissan and INFINITI applications
• Narrow-band heated oxygen sensor with standard replacement grade
• Specific fit with threaded mounting and 18 mm thread diameter
• 4-wire design with square male connector and blade terminals
• Wiring harness included for cleaner replacement routing
• Metal housing with steel finish for underbody durability
• Wiring harness length: 8.7 in; overall length: 12.4 in

Detailed Description

Bosch 15525 is engineered as a switching-type oxygen sensor that reports exhaust oxygen content to the engine control unit so fuel delivery can be adjusted accurately. The narrow-band heated design helps the sensor reach operating temperature quickly, supporting faster closed-loop response after startup and steady signal output during normal driving. This makes it a practical replacement for Nissan Altima, Nissan Sentra, Nissan Maxima, Nissan Murano, Nissan Quest, Nissan X-Trail, and select INFINITI models that use the listed downstream or upstream positions.

This part cross-references Nissan 226A1AR210 and 226908J001 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings at the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to exhaust feedback faults
• Rough idle or drivability issues caused by inaccurate air-fuel control

Installation Notes and Tips

Verify the exact position before ordering, since this Bosch oxygen sensor is listed for downstream front, downstream, upstream right, downstream left, upstream, and downstream right locations depending on vehicle and engine configuration. Confirm connector shape, wire count, thread size, and harness routing against the original sensor before installation. Use the correct 22 mm hex size and 18 mm threaded mounting point, and inspect the exhaust bung threads for damage or corrosion before tightening.

Compatible With 2002-2006 INFINITI Q45, downstream left; 2002-2005 INFINITI Q45, upstream right; 2003-2004 INFINITI M45, upstream right; 2003-2004 INFINITI M45, downstream left; 2003-2005 INFINITI FX45, upstream right; 2004-2005 Nissan Sentra, upstream; 2004-2006 Nissan Altima, downstream; 2004-2006 Nissan Sentra, downstream; 2004 Nissan Quest, downstream right; 2005-2006 Nissan Altima, downstream; 2005-2006 Nissan Quest, downstream front; 2005-2006 Nissan X-Trail, upstream; 2006 INFINITI FX45, upstream right; 2006 INFINITI Q45, upstream right; 2008 Nissan Maxima, downstream; 2009 Nissan Quest, downstream front.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this product line. The Bosch Engineered Oxygen Sensor series uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials to support consistent performance in demanding thermal and vibration conditions.