Bosch 18041 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Mazda 3

Bosch Validated Oxygen Sensor 18041 is a narrow-band heated downstream O2 sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for 2010-2013 Mazda 3, 2010 Mazda 3 Sport, and 2012-2013 Mazda 3 Sport applications listed below.

Key Features

• Specific-fit Bosch Validated Oxygen Sensor for direct application matching
• Narrow-band heated design for stable closed-loop fuel control
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 4-wire configuration with square male connector and blade terminals
• Wiring harness included with 10.6 in harness length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Downstream sensor placement for Mazda 3 and Mazda 3 Sport fitments

Product Details

Bosch part number 18041 is part of the Bosch Validated Oxygen Sensor line, a product line focused on OE-style replacement sensors with Bosch-developed sensing technology. Bosch has decades of oxygen sensor development behind this design, including narrow-band switching sensor architecture that supports accurate lambda feedback, faster sensor response, and reliable operation under heat and vibration. For drivers searching for a downstream oxygen sensor for 2010-2013 Mazda 3 or a 2010-2013 Mazda 3 Sport oxygen sensor replacement, this unit provides the correct threaded, heated, narrow-band configuration.

This part cross-references Monroe Shocks & Struts (e.g., L54118861A) for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control unit
• Reduced fuel control accuracy during closed-loop operation
• Emissions test failures tied to sensor response or signal quality
• Rough combustion control caused by a worn or slow-responding O2 sensor

Installation Notes

Compatible With 2010-2013 Mazda 3, downstream; 2010 Mazda 3 Sport, downstream; and 2012-2013 Mazda 3 Sport, downstream. Verify connector shape, wire count, thread size, and sensor position before installation. The sensor uses a threaded mount with an 18 mm thread diameter and a square 4-pin connector, so matching the original connector and exhaust bung is important for proper installation.

Quality Assurance

Bosch oxygen sensors are backed by more than five decades of OE development and are built to the same engineering standards that support original equipment applications. Bosch Validated Oxygen Sensor 18041 is designed for consistent signal accuracy and durable service in harsh exhaust environments.