Bosch 18179 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Jetta

Bosch 18179 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit replacement for the downstream position on select 2016-2018 Volkswagen Jetta models, helping maintain stable combustion control and emissions performance.

The Bosch Validated Oxygen Sensor line reflects Bosch OE development experience, including ceramic sensing elements, controlled heater operation, and durable materials for high-temperature, high-vibration environments. For drivers searching for a downstream oxygen sensor for 2016-2018 Volkswagen Jetta, Bosch 18179 provides an OE-style replacement built around the original application.

Key Features

• Part number 18179 Bosch Validated Oxygen Sensor
• Specific-fit downstream oxygen sensor for select Volkswagen Jetta applications
• Narrow-band heated O2 sensor for closed-loop fuel control
• 4-wire design with oblong male connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with a 35.6 in harness length
• Metal housing and high-temperature-resistant construction

Detailed Description

Bosch 18179 is engineered as a standard replacement oxygen sensor for vehicles that rely on narrow-band switching-type feedback. It measures exhaust oxygen content and sends data to the ECU so the engine can maintain the correct air-fuel ratio during normal operation. This downstream sensor application is listed for 2016-2018 Volkswagen Jetta models, making it a direct-fit choice for owners replacing a worn or slow-responding sensor. Bosch 18179 also cross-references Volkswagen OE part 04E906262EF for the same application.

As part of the Bosch Validated Oxygen Sensor line, this sensor benefits from Bosch’s long OE development history and use of advanced ceramic sensing elements, optimized heater control, and durable materials designed for demanding thermal conditions. If you are searching for a Bosch 18179 oxygen sensor for Volkswagen Jetta downstream service, this part is built to restore accurate exhaust feedback and consistent engine management.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Slow or inaccurate downstream O2 sensor readings
• Unstable closed-loop fuel control
• Emissions test failures tied to sensor response issues
• Fuel mixture correction problems caused by a degraded sensor

Installation Notes and Tips

Confirm the downstream location before ordering and match the connector, thread size, and wire count to the original sensor. The threaded 18 mm design uses a 22 mm hex, and the included harness length should be checked against the vehicle routing before installation. For best results, inspect the exhaust bung threads and connector condition during replacement on 2016-2018 Volkswagen Jetta models.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to OE-proven standards used by vehicle manufacturers. Bosch 18179 is a direct replacement option for the specified downstream application.