Bosch 13256 Oxygen Sensor - Downstream Front, Downstream Left or Upstream

Bosch Oxygen Sensor for Honda and Acura

Bosch 13256 is a narrow-band heated oxygen sensor built for specific downstream and upstream applications on select Honda, Acura, and Saturn vehicles. It provides the ECU with air-fuel-ratio feedback for stable combustion control and lower emissions, with OE-style fitment for direct replacement service.

Key Features

• Bosch Engineered Oxygen Sensor line with OE development heritage
• Narrow-band heated O2 sensor for faster closed-loop operation
• Specific fit design with threaded mounting
• 4-wire configuration with rectangular male connector
• Wiring harness included for direct replacement installation
• Metal housing with high-temperature-resistant construction
• 18 mm thread size and 22 mm hex size

Product Details

The Bosch Engineered Oxygen Sensor line builds on Bosch’s long history in oxygen sensing, including early thimble-style designs and later planar narrowband technology. Bosch 13256 uses advanced ceramic sensing elements and controlled heater performance to deliver accurate lambda feedback under changing exhaust temperatures and vibration. This helps the engine management system maintain the correct air-fuel ratio during normal driving, cold starts, and steady-state operation. For drivers searching for a Bosch 13256 oxygen sensor for Honda Odyssey, Acura TL, or Honda Pilot downstream front service, this part provides an OE-proven replacement path.

This part cross-references Honda/Acura OE numbers such as 36531P8DJ21 and 36532RCAA51 for the same application.

Used For

• Check engine light caused by oxygen sensor circuit or response faults
• Rich or lean fuel trim conditions tied to inaccurate O2 feedback
• Reduced fuel control stability during closed-loop operation
• Emissions test failures related to sensor performance
• Slow sensor switching on heated narrow-band applications

Installation Notes

Fits 2005-2010 Honda Odyssey, Downstream Front; 2005-2008 Acura RL, Downstream Front; 2006-2008 Honda Pilot, Downstream Left; 2005-2008 Honda Pilot, Downstream Front; 2006-2008 Honda Ridgeline, Downstream Front; 2005-2007 Honda Accord, Downstream Front; 2004-2007 Saturn Vue, Downstream Front; 2003-2006 Acura MDX, Downstream Front; 2006 Acura TL, Downstream Front; 2004-2005 Acura TL, Downstream Left; 2003-2005 Honda Accord, Downstream Left; 2001-2003 Acura CL, Upstream; 2000-2003 Acura TL, Upstream.

Verify connector shape, wire count, thread size, and sensor position before installation. Use the existing harness routing and confirm the exhaust bung threads are clean before tightening. This Bosch 13256 oxygen sensor is a specific-fit replacement, so matching the exact position is important for proper operation.

Quality Assurance

Bosch supplies oxygen sensors with OE-focused engineering, using durable materials and heater control strategies developed for demanding thermal and vibration conditions. The Bosch Engineered Oxygen Sensor line is backed by more than five decades of OE development experience.