Bosch 15757 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Bosch Actual OE Oxygen Sensor 15757

Bosch 15757 is a specific-fit, narrow-band heated oxygen sensor built for downstream applications on select Nissan and INFINITI vehicles. It provides the air-fuel ratio feedback the ECU uses to maintain stable closed-loop operation and emissions control.

For shoppers searching for a downstream oxygen sensor for 1996-2001 Nissan Altima, Sentra, 200SX, 240SX, or INFINITI Q45, Bosch 15757 offers OE-style fitment with the connector, harness, and threaded mounting details needed for direct replacement.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor for direct replacement applications
• Narrow-band heated O2 sensor with 4-wire configuration
• Square male connector with blade terminals
• Threaded mounting design with 18 mm thread size and 22 mm hex size
• Wiring harness included with 7.7 in harness length
• Steel-finish metal housing for high-temperature service
• Downstream fitment for select Nissan and INFINITI models

Product Details

Bosch 15757 is part of Bosch’s Actual OE Oxygen Sensor line, which draws on Bosch’s long history of OE oxygen sensor development. Bosch introduced the original thimble-style sensor in 1976 and later advanced planar narrowband designs to improve light-off speed, lambda accuracy, and closed-loop response. This sensor uses a heated narrow-band design with ceramic sensing elements and temperature-resistant materials to maintain consistent signal output under thermal and vibration stress. It is a direct replacement choice for drivers and technicians servicing downstream oxygen sensor faults on 1996-2001 Nissan Altima, 1997-1999 Nissan Sentra, and related applications, as well as 1997-2001 INFINITI Q45 coverage.

This part cross-references Bosch 15757 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Rough or unstable fuel control caused by inaccurate O2 feedback
• Emissions test failures tied to sensor response issues
• Slow closed-loop operation after warm-up
• Signal degradation from heat, age, or vibration exposure

Installation Notes

• Verify the vehicle’s year, model, and downstream position before ordering.
• Confirm the connector shape, terminal count, and harness length match the original sensor.
• Threaded installation uses an 18 mm sensor thread and 22 mm hex size.
• For 1996 Nissan Altima, confirm the build date and California emissions configuration listed in the fitment data.
• Clear diagnostic trouble codes after installation and verify closed-loop operation.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and aftermarket supply built around the same engineering standards used by vehicle manufacturers. The design emphasizes accurate signal output, durable heater control, and reliable operation in demanding exhaust conditions.