Bosch 15401 Oxygen Sensor

Bosch Wideband Oxygen Sensor for Honda and Acura

Bosch Validated Oxygen Sensor 15401 is a specific-fit wideband air-fuel ratio sensor for select Honda, Acura, and Saturn applications. It provides continuous, high-precision air-fuel measurement across the full lambda range, helping the engine control module manage mixture control with greater detail than a traditional switching sensor.

Built with a planar pump-cell design, fast light-off response, optimized heater control, and a durable ceramic body, this Bosch Validated Oxygen Sensor is made for stable operation during rapid load changes and repeated heat cycles. It is a direct replacement choice for vehicles such as the Acura TL, Honda Accord, Honda Pilot, and Honda Ridgeline, and the Bosch 15401 part number is commonly searched for upstream sensor service.

• Wideband A/F oxygen sensor for precise air-fuel ratio feedback
• Specific-fit design with 5-wire harness and included wiring harness
• Heated sensor with optimized heater control for quicker operating temperature
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Rectangle male connector, blade terminals, and 8-terminal configuration
• Standard replacement grade for OE-style service on emission control systems
• Fits upstream front, upstream rear, upstream left, upstream right, and upstream positions where listed

Detailed Application and Function

Bosch 15401 is part of the Bosch Validated Oxygen Sensor line, a product line focused on OE-proven sensor design and validated aftermarket coverage. Bosch pioneered the wideband A/F oxygen sensor architecture, and this sensor uses that foundation to deliver continuous feedback for modern engine management. It is a strong match for drivers searching for a Honda Accord oxygen sensor, Acura MDX upstream sensor, or Honda Pilot wideband O2 sensor replacement.

This part cross-references Honda and GM applications such as 36531PHMA02 and 12581687 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Rough idle, hesitation, or inconsistent throttle response tied to mixture control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Elevated emissions from delayed or unstable sensor response

Installation Notes and Tips

Confirm the exact position before ordering, since this Bosch 15401 application list includes upstream front, upstream rear, upstream left, upstream right, and upstream locations depending on vehicle. Verify connector shape, terminal count, thread size, and harness length against the original sensor before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads and wiring routing during replacement.

Quality Assurance

Bosch has more than five decades of OE development experience in engine management and emission control sensors. The Bosch Validated Oxygen Sensor line is built to OE-style standards for accurate signal delivery, reliable heater performance, and durable construction in demanding thermal conditions.