Bosch 18047 Oxygen Sensor - Downstream or Downstream Right

Bosch Validated Oxygen Sensor for Toyota Sienna

Bosch 18047 is a specific-fit, narrow-band heated oxygen sensor built for downstream applications on select Toyota Sienna models. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate combustion management, and lower emissions.

For Toyota Sienna owners searching for a downstream oxygen sensor replacement, Bosch 18047 delivers OE-style fitment with a threaded mount, 4-wire configuration, and integrated wiring harness.

Key Features

• Specific-fit Bosch Validated Oxygen Sensor for select Toyota Sienna applications
• Narrow-band heated oxygen sensor for faster closed-loop operation
• 4-wire design with pin terminals and female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included for direct replacement use
• Part number 18047 for easy identification and ordering

Product Details

Bosch 18047 is part of Bosch’s Validated Oxygen Sensor line, which builds on decades of OE oxygen sensor development. Bosch pioneered the original thimble-style sensor in 1976 and later advanced planar narrowband designs that improve light-off speed, lambda accuracy, and closed-loop response. This sensor uses a heated narrow-band design with ceramic sensing elements and optimized heater control to maintain consistent signal output under thermal and vibration stress. It is a direct replacement for downstream right and downstream positions on 2011-2014 Toyota Sienna models, and it cross-references 8946508060 and 8946508100 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Delayed closed-loop fuel control after startup
• Rough combustion control caused by a worn downstream sensor
• Emissions test failures tied to sensor response issues

Installation Notes and Tips

Verify the connector shape, wire count, and mounting location before installation. This Bosch 18047 sensor uses a threaded mount, 4-wire harness, and female connector, so it should be matched to the original downstream sensor configuration on the vehicle. Inspect the exhaust bung threads and wiring routing before tightening the sensor to the specified torque.

Compatible with 2011-2014 Toyota Sienna, downstream right, and 2011-2013 Toyota Sienna, downstream. Confirm the exact position on the vehicle before ordering.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket application coverage. The Bosch Validated Oxygen Sensor line is engineered to deliver consistent signal accuracy and durable performance in harsh exhaust environments.