Bosch 15314 Oxygen Sensor

Bosch Oxygen Sensor for Mazda and Kia

Bosch Part Number 15314 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management across changing engine conditions, making it a direct replacement choice for select Mazda, Ford, and Kia applications.

• Specific-fit Bosch Engineered Oxygen Sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with blade terminals and rectangular connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included; harness length measures 12.6 in
• Overall length: 16.3 in; sealing surface to connector end: 15.2 in
• Standard replacement grade with metal housing and steel finish

OE-Style Sensor Technology

Bosch Engineered Oxygen Sensor 15314 uses a switching-type narrow-band design that measures exhaust oxygen content and sends the signal needed for fuel control. Bosch has decades of OE development behind this sensor family, including ceramic sensing elements, controlled heater operation, and high-temperature materials that help maintain consistent readings under heat and vibration. This makes Bosch 15314 a practical replacement for drivers servicing Mazda 626, Mazda MX-6, Mazda MPV, Mazda 929, Ford Probe, and Kia Rio applications where accurate upstream or downstream oxygen sensor performance matters.

This part cross-references select OE numbers such as AJ51188619U and KLA6188619U for the same application.

Vehicle Fitment

• Fits 2003-2008 Mazda 6, Upstream Rear
• Fits 2002-2006 Mazda MPV, Upstream Rear
• Fits 2002-2006 Mazda MPV, Upstream Front
• Fits 2001-2002 Kia Rio, Upstream
• Fits 2001-2002 Mazda 626, Upstream Right
• Fits 2000-2001 Mazda MPV, Upstream Right
• Fits 2000 Mazda 626, Upstream Right; with California Emission System
• Fits 2000 Mazda 626, Downstream; Located After Primary Converter; without California Emission System
• Fits 1997-1999 Mazda 626, Downstream; Located After Primary Converter
• Fits 1997 Ford Probe, Downstream Left
• Fits 1997 Mazda MX-6, Downstream; Located After Primary Converter
• Fits 1996 Ford Probe, Downstream Front; USA Built
• Fits 1996 Mazda 626, Downstream Front
• Fits 1996 Mazda MX-6, Downstream Front
• Fits 1994-1995 Mazda 626, Upstream Left; without California Emission System
• Fits 1993-1995 Mazda 626, Upstream
• Fits 1992-1995 Mazda 929, Upstream Right
• Fits 1993-1995 Mazda MX-6, Upstream
• Fits 1994-1995 Mazda MX-6, Upstream Left; without California Emission System
• Fits 1993 Mazda 626, Upstream; Standard
• Fits 1993 Mazda MX-6, Upstream Left

What This Sensor Helps Address

• Check engine light related to oxygen sensor signal faults
• Rough idle or unstable fuel mixture control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow closed-loop response during warm-up or driving transitions
• Emissions test failures tied to sensor performance

Installation Notes and Quality

Verify connector shape, wire count, thread size, and sensor position before installation. This Bosch 15314 oxygen sensor uses a threaded mount with a 18 mm thread diameter, so proper removal and installation tools are recommended to avoid damage to the exhaust bung. Confirm the vehicle’s upstream or downstream location and any emission-system notes listed in the fitment data before ordering.

Bosch backs this oxygen sensor line with long-term OE development experience and materials selected for heat and vibration resistance. The result is a standard replacement sensor built to deliver consistent signal quality for the listed Mazda, Ford, and Kia applications.