Bosch 15266 Oxygen Sensor - Downstream Left, Upstream or Upstream Left

Bosch Oxygen Sensor for Mazda and Ford

Bosch Engineered Oxygen Sensor 15266 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in select Mazda and Ford applications, including Mazda Miata, Mazda Millenia, Mazda MPV, Mazda 626, Mazda MX-6, and Ford Probe.

Key Features

• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band heated sensor for faster closed-loop operation
• 4-wire design with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangle female connector with pin terminals
• Metal housing and high-temperature-resistant construction
• Overall length: 19.3 in; sealing surface to connector end: 18.1 in

Product Details

Bosch 15266 uses advanced ceramic sensing elements and optimized heater control to deliver consistent signal output under heat and vibration. As part of the Bosch Engineered Oxygen Sensor line, it reflects Bosch’s long OE development history in oxygen sensing technology, including narrowband designs that improve light-off response and closed-loop readiness. This part cross-references Bosch-style OE applications for the same vehicle coverage and is used in select Mazda Miata, Mazda Millenia, Mazda MPV, Mazda 626, Mazda MX-6, and Ford Probe configurations.

What It Helps Address

• Check engine light related to oxygen sensor signal faults
• Rich or lean fuel mixture caused by inaccurate O2 feedback
• Slow closed-loop response after startup
• Emissions test failures tied to sensor performance
• Rough idle or unstable combustion control from degraded sensor output

Installation Notes

Fits 2004-2005 Mazda Miata, Upstream; 2001-2002 Mazda Millenia, Downstream Left; 1995-1996 Mazda Millenia, Downstream Left; 2000-2001 Mazda MPV, Upstream Left; 2000 Mazda 626, Upstream; 1997-2000 Mazda Millenia, Upstream Left; 1996-1997 Ford Probe, Upstream; 1996-1997 Mazda 626, Upstream; and 1996-1997 Mazda MX-6, Upstream. Confirm the connector style, threaded mounting, and sensor position before installation. Use the existing harness routing and verify the 18 mm thread size and 22 mm hex fitment during replacement.

Quality Assurance

Bosch supplies oxygen sensors with OE-proven engineering and durable materials selected for demanding thermal conditions. Bosch 15266 is built to deliver consistent sensor performance across the listed Mazda and Ford applications.