Bosch 16246 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Ford Focus

Bosch 16246 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for downstream service on 2012-2018 Ford Focus models, helping maintain stable combustion control and emissions performance.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor for downstream applications
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with square female connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with 24.9 in harness length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Bosch part number 16246 for Ford Focus oxygen sensor replacement

Product Details

Bosch 16246 uses a switching-type narrow-band sensing element to report exhaust oxygen content to the engine control unit. Bosch developed this OE-focused oxygen sensor line from its long history in oxygen sensing technology, including planar narrowband designs that improve response time and closed-loop accuracy. For 2012-2018 Ford Focus downstream service, this sensor provides the signal needed for fuel control after the catalytic converter and supports consistent emissions monitoring. If you are searching for a Bosch 16246 Ford Focus downstream oxygen sensor or an OE-style replacement oxygen sensor for 2012-2018 Ford Focus, this part matches the listed application.

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

Common Issues This Part Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough fuel control caused by a worn or contaminated sensor

Installation Notes

Verify the connector shape, wire count, thread size, and downstream position before installation. The sensor is threaded and heated, so use the correct oxygen sensor socket and follow service procedures for exhaust-thread removal and torque. Confirm the harness routing matches the original layout on the Ford Focus to avoid heat damage or strain on the lead.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor as a standard replacement part backed by more than five decades of OE development and aftermarket support. The design uses advanced ceramic elements, controlled heater operation, and heat-resistant materials to maintain consistent sensor output under thermal and vibration load.