Bosch 15518 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Nissan Downstream Fitment

Bosch Engineered Oxygen Sensor 15518 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for select Nissan applications, including downstream service on Altima, Sentra, and X-Trail models.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with square connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with 15.9 in harness length
• Metal housing built for high-temperature and vibration exposure
• Bosch Engineered Oxygen Sensor line draws on Bosch OE development history

Product Details

Bosch 15518 is a standard replacement oxygen sensor that uses advanced ceramic sensing elements and controlled heater operation to deliver consistent signal response under demanding exhaust conditions. As part of the Bosch Engineered Oxygen Sensor line, it reflects Bosch’s long OE development background in oxygen sensing technology, including narrowband designs that improve light-off response and closed-loop readiness. This part cross-references Bosch Engineered Oxygen Sensor applications such as 226A08J001 and 226A08J010 for the same application.

Compatible With 2002-2003 Nissan Altima, downstream; 2002-2003 Nissan Sentra, downstream; 2005-2006 Nissan X-Trail, downstream. Bosch 15518 is a direct-fit choice for Nissan downstream oxygen sensor replacement when the original sensor has aged, slowed response, or triggered emissions-related faults.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel trim readings caused by a slow sensor signal
• Reduced closed-loop fuel control accuracy
• Emissions test failures tied to downstream sensor faults
• Rough combustion control from degraded O2 sensor output

Installation Notes and Tips

Verify the connector shape, 4-wire layout, and threaded mounting style before installation. Confirm downstream placement and match the 18 mm thread size and 22 mm hex size to the original sensor. Inspect the exhaust bung threads and wiring routing before tightening the sensor to avoid cross-threading or harness strain.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE sensor development and aftermarket supply experience. The Bosch Engineered Oxygen Sensor line is built to OE-proven standards for accuracy, durability, and consistent operation in harsh thermal conditions.