Bosch 18048 Oxygen Sensor - Downstream Front, Downstream Left or Downstream Right

Bosch Validated Oxygen Sensor for Honda and Acura

The Bosch Validated Oxygen Sensor 18048 is a direct-fit, narrow-band heated O2 sensor built for specific downstream applications on select Honda and Acura vehicles. It provides the ECU with precise air-fuel-ratio feedback to support stable combustion control and lower emissions across changing operating conditions.

Backed by Bosch’s long OE development history, this sensor uses a threaded metal housing, a 4-wire blade-terminal design, and an included wiring harness for a clean replacement on the correct downstream right, downstream left, or downstream front location, depending on the vehicle.

Key Features

• Specific-fit Bosch Validated Oxygen Sensor, part number 18048
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Threaded mounting with 18 mm thread size and 22 mm hex size
• 4-wire design with rectangular male connector and blade terminals
• Metal housing with high-temperature-resistant construction
• Wiring harness included for the listed application
• OE-style replacement for select Acura MDX, TLX, RDX, RLX, TL, ZDX, RL and Honda Accord, Odyssey, Pilot, Ridgeline, Crosstour

Product Details

Bosch Validated Oxygen Sensor 18048 is engineered as a standard replacement for narrow-band heated oxygen sensor applications where accurate exhaust oxygen feedback is required. Bosch’s switching-type O2 sensor design measures air-fuel ratio for the ECU, helping maintain consistent combustion control and emissions performance. The sensor uses advanced ceramic elements and optimized heater control to improve light-off and closed-loop response, while the durable metal body is built to handle heat and vibration in everyday driving.

This part cross-references Honda/Acura OE numbers 36532RN0A01 and 36542RV0A01 for the same application. It is a strong fitment match for downstream right service on 2014-2020 Acura MDX, 2015-2020 Acura TLX, and 2016-2018 Honda Pilot, as well as other listed Honda and Acura applications. Part number 18048 is also a useful search reference when ordering the correct Bosch oxygen sensor for these vehicles.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings sent to the ECU
• Rough idle or unstable closed-loop fuel control
• Emissions test failures tied to sensor response issues
• Slow sensor switching caused by age, heat, or contamination

Installation Notes and Tips

Confirm the exact year, make, model, and sensor position before ordering, since this Bosch 18048 application is specific to downstream right, downstream left, or downstream front locations depending on the vehicle. Verify the 4-wire connector, rectangular plug shape, 18 mm thread size, and threaded mounting style match the original sensor. For best results, inspect the exhaust bung threads and wiring routing before installation, and follow the vehicle service procedure for connector access and torque specification.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development, and the Validated Oxygen Sensor line is built to reflect that OE-focused engineering. Bosch 18048 is designed with durable materials, heater control, and sensor elements intended to deliver consistent performance in demanding thermal and vibration conditions.