Bosch 18050 Oxygen Sensor - Downstream or Downstream Left

Bosch Oxygen Sensor for Honda and Acura

Bosch Part Number 18050 is a direct-fit, heated narrow-band oxygen sensor for downstream applications on select Honda and Acura vehicles. It provides precise air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions across changing driving conditions.

Built with Bosch Engineered Oxygen Sensor technology, this replacement sensor uses a threaded metal housing, 4-wire pin connector, and integrated wiring harness for OE-style serviceability on the listed applications.

Key Features

• Direct-fit oxygen sensor for downstream and downstream left positions
• Heated narrow-band design for faster closed-loop operation
• 4-wire configuration with rectangular female connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Specific-fit replacement for select Acura ILX, TLX, RDX, RLX, MDX, TSX and Honda Accord, Civic, CR-V, Crosstour, HR-V, Pilot, and Ridgeline applications
• Bosch Part Number 18050 for OE-style replacement service

Product Details

Bosch engineered oxygen sensors are developed from decades of OE sensor design, including the original Bosch thimble sensor and later planar narrowband technology. This sensor is designed to deliver accurate lambda feedback, quicker light-off, and consistent heater-controlled operation under high heat and vibration. For drivers searching for a Bosch 18050 oxygen sensor for Honda Accord downstream, Acura TLX downstream left, or Honda CR-V downstream replacement, this part matches the listed vehicle-specific applications and positions.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings sent to the ECU
• Rough idle or unstable combustion control caused by aging sensor response
• Increased emissions from a slow or inaccurate downstream sensor
• Delayed closed-loop operation after startup

Installation Notes and Fitment

Compatible With 2021-2022 Acura ILX, downstream; 2016-2022 Honda HR-V, downstream; 2013-2020 Acura ILX, downstream; 2014-2020 Acura RLX, downstream left; 2015-2020 Acura TLX, downstream; 2020 Honda Pilot, downstream left; 2017-2019 Honda Ridgeline, downstream left; 2016-2018 Acura RDX, downstream left; 2013-2017 Honda Accord, downstream; 2013-2017 Honda Accord, downstream left with California Emission System; 2013-2017 Honda Accord, downstream left without California Emission System; 2016-2017 Honda Pilot, downstream left; 2010-2016 Honda CR-V, downstream; 2014-2015 Acura MDX, downstream left; 2015 Acura TLX, downstream left; 2012-2015 Honda Civic, downstream; 2013-2015 Honda Crosstour, downstream left; 2009-2014 Acura TSX, downstream; 2008-2012 Honda Accord, downstream.

• Verify the connector shape, wire count, and mounting style before installation.
• Use the listed downstream or downstream left position only.
• Inspect the exhaust threads and sealing surface before threading in the sensor.
• Confirm the vehicle’s emission configuration where noted, especially on 2013-2017 Honda Accord applications.

Quality Assurance

Bosch supplies oxygen sensors backed by more than five decades of OE development and aftermarket engineering. The Bosch Engineered Oxygen Sensor line is built for durable, accurate operation using high-temperature-resistant materials, ceramic sensing elements, and controlled heater performance.