Bosch 18031 Oxygen Sensor

Bosch Oxygen Sensor for Honda and Acura

Bosch Engineered Oxygen Sensor 18031 is a specific-fit, narrow-band heated O2 sensor built for downstream applications on select Honda and Acura vehicles. It provides precise air-fuel-ratio feedback to the ECU for stable combustion control and lower emissions.

With a threaded mounting design, 4-wire harness, and rectangular male connector, this Bosch oxygen sensor is built for direct replacement service on many Honda Accord, Pilot, Ridgeline, Odyssey, and Acura RLX, TL, TSX, MDX, RDX, RL, and ZDX applications.

Key Features

• Bosch Engineered Oxygen Sensor line with OE-focused design and calibration
• Part number 18031 for specific-fit replacement use
• Narrow-band heated oxygen sensor for downstream air-fuel monitoring
• 4-wire configuration with included wiring harness
• Threaded 18 mm mounting with 22 mm hex size
• Rectangular male connector and blade terminals
• Metal housing with high-temperature-resistant construction
• Overall length: 23.4 in; harness length: 19.7 in

Product Details

Bosch developed its oxygen sensor technology from early thimble-style designs to later planar narrowband sensors that respond faster and reach closed-loop operation sooner. Bosch 18031 uses advanced ceramic sensing elements and controlled heater performance to deliver consistent signal output under heat and vibration. For drivers and technicians servicing a Honda Accord downstream right oxygen sensor or an Acura TL downstream left oxygen sensor, this part number 18031 offers a direct replacement path with OE-proven engineering.

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

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings sent to the ECU
• Rough combustion control during closed-loop operation
• Elevated emissions from a worn downstream O2 sensor
• Slow sensor response caused by heater or element degradation

Installation Notes

• Compatible With 2008-2012 Honda Accord, downstream left and downstream right
• Compatible With 2008-2009 Honda Accord, downstream left and downstream right, with or without California Emission System depending on application
• Compatible With 2009-2014 Honda Pilot, downstream front and downstream rear
• Compatible With 2009-2014 Honda Ridgeline, downstream front and downstream rear
• Compatible With 2010-2013 Acura ZDX, downstream right
• Use the threaded 18 mm sensor mount and verify connector routing before installation
• Confirm the downstream position and emission-system notes against the vehicle before replacement

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emission-control sensing. The Bosch Engineered Oxygen Sensor line is built to the same quality standards trusted by vehicle manufacturers, with durable materials selected for thermal and vibration resistance.