Bosch 15782 Oxygen Sensor - Upstream

Bosch Wideband Oxygen Sensor for Precise Fuel Control

Bosch Validated Oxygen Sensor 15782 is a heated wideband A/F oxygen sensor built for accurate air-fuel ratio measurement across the full lambda range. It provides the ECU with detailed feedback for cleaner combustion, stable drivability, and consistent emissions control. This Bosch 15782 oxygen sensor fits specific applications, including the upstream sensor position on select Mazda CX-7 and Mazda 6 models.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio monitoring
• Heated design for faster sensor activity and stable operation
• Specific fit replacement with a 5-wire harness and 8 terminals
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Metal housing with integrated wiring harness and rectangle/square connector
• Overall length: 32.7 in; sealing surface to connector end: 31.5 in

Product Details

Bosch 15782 is part of the Bosch Validated Oxygen Sensor line, a product line focused on OE-style replacement sensors for modern engine management systems. Bosch pioneered the wideband A/F oxygen sensor design used in many current emissions strategies, and this sensor reflects that engineering approach with fast light-off, optimized heater control, and durable ceramic construction. It is a direct-fit, upstream wide band sensor for 2007-2012 Mazda CX-7 and 2006-2007 Mazda 6 applications, making it a strong choice when replacing a worn or slow-responding sensor. This Bosch 15782 sensor cross-references Mazda L3BT188G1A and L3M6188G1F for the same application.

Common Issues This Sensor Can Help Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Rough idle or inconsistent throttle response caused by aging sensor feedback
• Reduced fuel economy from inaccurate mixture control
• Higher emissions from delayed or unstable sensor response

Installation Notes and Tips

Install this sensor in the upstream position only where specified by the vehicle application. Confirm the 18 mm thread size, 5-wire harness, rectangle/square connector, and overall length before installation. Because this is a threaded wideband sensor, use the correct oxygen sensor socket and avoid contaminating the sensing element during handling. Verify connector routing and harness clearance on Mazda CX-7 and Mazda 6 applications before final tightening.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and validated aftermarket engineering. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accurate signal output, reliable heater performance, and long-term durability in demanding thermal conditions.