Bosch 15949 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Nissan Altima

Bosch 15949 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It uses a narrow-band heated design with a threaded mount, square connector, and included wiring harness for direct replacement service on select Nissan Altima downstream applications.

For 2001 Nissan Altima downstream and 2002-2004 Nissan Altima downstream, Bosch 15949 supports stable closed-loop fuel control and consistent emissions monitoring. This Bosch Actual OE Oxygen Sensor is a direct-fit replacement for the original sensor location after the primary converter.

Key Features

• Actual OE Oxygen Sensor for direct replacement service
• Narrow-band heated sensor type for faster operating response
• Specific fit design with threaded mounting
• 4-wire configuration with blade terminals and square connector
• Metal housing with high-temperature-resistant construction
• Wiring harness included for the listed application
• Part number 15949 for easy identification

Product Details

Bosch 15949 is part of the Bosch Actual OE Oxygen Sensor line, which builds on Bosch’s long history of oxygen sensor development and OE supply. The sensor uses advanced ceramic elements and heater control to deliver accurate switching-type oxygen readings under changing exhaust temperatures and vibration loads. For Nissan Altima owners searching for a downstream oxygen sensor replacement, Bosch 15949 provides the correct narrow-band format for the listed 2001-2004 applications.

This part cross-references 226A09E801 and 226A18J100 for the same application. Bosch 15949 is a practical choice when you need a direct-fit downstream oxygen sensor for Nissan Altima emissions service.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback to the engine control unit
• Unstable closed-loop fuel control after the primary converter
• Emissions test failures tied to oxygen sensor readings
• Slow sensor response from a worn narrow-band O2 sensor

Installation Notes

Install Bosch 15949 in the downstream position specified for the vehicle application. Verify the 18 mm thread diameter, 22 mm hex size, 4-wire connector layout, and harness routing before installation. Because this is a specific-fit sensor, confirm the connector shape and mounting location match the original part on the Nissan Altima.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement backed by decades of sensor development and aftermarket support. The Actual OE line is built to meet the demands of factory-style emissions control service.