Bosch 18002 Oxygen Sensor - Upstream Left

Bosch Actual OE Oxygen Sensor for Nissan

Bosch Part Number 18002 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is listed for the upstream left position on 2004 Nissan Frontier and 2004 Nissan Xterra, making it a direct-match option for common Nissan oxygen sensor replacement needs.

The Bosch Actual OE Oxygen Sensor line reflects Bosch’s OE development history, including narrowband sensor designs that improve closed-loop response and lambda accuracy. This sensor uses a threaded metal housing, a rectangular male connector, and an included wiring harness for a clean replacement on the correct application.

Key Features

• Fits 2004 Nissan Frontier, upstream left
• Fits 2004 Nissan Xterra, upstream left
• Bosch Part Number 18002
• Specific-fit, standard replacement oxygen sensor
• Narrow-band heated sensor for closed-loop fuel control
• Threaded 18 mm mounting with 22 mm hex size
• 3-wire design with 4-terminal rectangular connector
• Wiring harness included for the listed application
• Steel-finish metal housing for high-temperature service

Detailed Description

Bosch 18002 is an Actual OE Oxygen Sensor engineered for accurate switching-type oxygen measurement in the exhaust stream. By sending reliable air-fuel-ratio data to the ECU, it helps the engine maintain stable combustion control and emissions performance under changing operating conditions. This Bosch oxygen sensor is a narrow-band heated design with a threaded 18 mm mount, male connector terminals, and a specific-fit configuration for the listed Nissan applications.

For shoppers searching for a 2004 Nissan Frontier upstream left oxygen sensor or a 2004 Nissan Xterra upstream left O2 sensor, Bosch Part Number 18002 provides an OE-style replacement built around Bosch’s long-running sensor development. This part cross-references Nissan 22691EK800 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Unstable air-fuel mixture feedback to the ECU
• Delayed closed-loop operation after startup
• Emissions test failures tied to sensor response issues
• Rough combustion control caused by inaccurate O2 readings

Installation Notes and Tips

Confirm the upstream left location before ordering, since this Bosch oxygen sensor is specific to the listed fitment. Inspect the connector style, harness routing, and thread size before installation, and use the correct 18 mm oxygen sensor socket or wrench for removal and tightening. Verify the exhaust bung threads are clean and undamaged so the sensor seats properly.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE sensor development. The design uses advanced ceramic elements, controlled heater operation, and high-temperature-resistant materials to maintain consistent performance in demanding exhaust conditions.