Bosch 15937 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Nissan Altima

Bosch 15937 is a specific-fit, narrow-band heated oxygen sensor for the downstream position on select 2002-2004 Nissan Altima models. It measures exhaust oxygen content and sends precise air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions management.

Built as part of Bosch Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long OE development history and uses ceramic sensing elements, controlled heating, and high-temperature materials for consistent signal output under demanding thermal and vibration conditions.

Key Features

• Fits 2002-2004 Nissan Altima, downstream
• Bosch part number 15937
• Actual OE Oxygen Sensor line
• Narrow-band heated oxygen sensor design
• Specific-fit replacement with 4-wire harness
• Threaded mounting with 18 mm thread diameter
• Square connector, male terminal and connector ends
• 15.2 in wiring harness length

Detailed Description

Bosch 15937 is an OE-style downstream oxygen sensor for the 2002-2004 Nissan Altima, located after the secondary converter. It is a narrow-band heated sensor with a threaded 18 mm mount, 22 mm hex size, and integrated wiring harness for direct replacement of the original sensor. Bosch’s switching-type O2 sensor design provides the ECU with accurate exhaust feedback so the engine can maintain proper combustion control and emissions performance. This part cross-references Hyundai/Kia OE number 226A08J100 for the same application.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Slow or inaccurate oxygen sensor signal response
• Incorrect air-fuel ratio feedback to the ECU
• Emissions test failures tied to sensor performance
• Rough closed-loop fuel control after catalyst monitoring issues

Installation Notes and Tips

Install Bosch 15937 in the downstream location after the secondary converter on the listed Nissan Altima applications. Confirm the connector shape, 4-wire layout, and threaded 18 mm sensor mount before installation. Inspect the exhaust bung threads and wiring routing, and verify the harness reaches the factory connector without strain.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor line with OE-proven engineering developed over decades of original equipment sensor production. The design uses durable materials and heater control strategies intended to maintain stable operation in high-heat exhaust environments.