Bosch 15873 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 15873

Bosch 15873 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for specific Nissan applications, including 1998-2000 Nissan Frontier downstream and 2000 Nissan Xterra downstream without California Emission System.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for closed-loop fuel control
• Specific fit with threaded mounting
• 4-wire design with square male connector
• 40.8 in wiring harness length with included harness
• 18 mm thread size and 22 mm hex size
• Metal housing with high-temperature-resistant construction

Product Details

Bosch developed this oxygen sensor line from its original OE sensor technology and later planar narrowband designs to improve light-off response, lambda accuracy, and closed-loop operation. Part number 15873 uses advanced ceramic sensing elements and controlled heater operation to deliver consistent signal output under heat and vibration. It is a standard replacement sensor for downstream monitoring on the Nissan Frontier and Nissan Xterra listed below.

Compatible With 1998-2000 Nissan Frontier, downstream; 2000 Nissan Xterra, downstream. This part cross-references Bosch-style OE applications such as 226A03S575 and 226A04S001 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough combustion control caused by aging sensor output

Installation Notes

Verify the connector shape, wire count, thread size, and downstream location before installation. This Bosch 15873 sensor uses a threaded mount, 4-wire harness, and square male connector; confirm the vehicle is without California Emission System for the listed Nissan applications. Inspect the exhaust bung threads and wiring routing before tightening the sensor into place.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and supplies aftermarket parts built to OE-proven standards. The sensor uses durable materials selected for thermal and vibration resistance in demanding exhaust environments.