Bosch 13287 Oxygen Sensor - Downstream Left, Upstream or Upstream Left

Bosch Oxygen Sensor for Mazda and Ford

Bosch 13287 is a narrow-band heated oxygen sensor built for specific vehicle applications that require accurate air-fuel feedback to the ECU. It supports stable combustion control, quicker closed-loop response, and lower emissions across changing operating conditions.

Use Bosch Engineered Oxygen Sensor 13287 when you need an OE-style replacement for select Mazda Millenia, Mazda 626, Mazda MX-6, and Ford Probe applications. This Bosch oxygen sensor uses a threaded mounting design, a 4-wire harness, and a rectangular female connector for direct-fit service on the listed positions.

Key Features

• Specific-fit oxygen sensor for listed Mazda and Ford applications
• Narrow-band heated design for faster light-off and closed-loop operation
• 4-wire configuration with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing built for high-temperature and vibration exposure
• Connector shape: rectangle; connector gender: female
• Overall length: 14.2 in; harness length: 10.5 in

Detailed Description

Bosch 13287 is part of the Bosch Engineered Oxygen Sensor line, a product line developed from Bosch OE oxygen sensor engineering and refined through narrowband planar sensor technology. The sensor measures exhaust oxygen content so the engine control unit can adjust fuel delivery with precision, helping maintain consistent combustion control. For drivers and technicians servicing a Mazda Millenia oxygen sensor, Mazda 626 oxygen sensor, Mazda MX-6 oxygen sensor, or Ford Probe oxygen sensor application, this part number provides a direct replacement option with the correct connector, thread size, and heated narrow-band design.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Excess fuel consumption from delayed sensor response
• Failed emissions testing tied to sensor degradation
• Slow closed-loop operation after startup

Installation Notes and Tips

Confirm the vehicle position before ordering: Fits 1995-1996 Mazda Millenia, Downstream Left; Fits 1997-2000 Mazda Millenia, Upstream Left; Fits 2001-2002 Mazda Millenia, Downstream Left; Fits 1996-1997 Mazda 626, Upstream; Fits 2000 Mazda 626, Upstream, without California Emission System; Fits 1996-1997 Mazda MX-6, Upstream; Fits 1996-1997 Ford Probe, Upstream. Verify connector style, thread size, and harness routing against the original sensor before installation.

Because this is a threaded oxygen sensor, use the correct oxygen sensor socket and follow proper torque procedures. Inspect the exhaust bung threads and wiring path for heat damage, corrosion, or contamination before installing the replacement.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this replacement part. The sensor uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials to support consistent operation in demanding exhaust environments.