Bosch 16148 Oxygen Sensor - Downstream

Bosch 16148 Oxygen Sensor for Ford Focus

Bosch 16148 is a narrow-band heated oxygen sensor built for downstream use on 2015-2018 Ford Focus models. It provides precise air-fuel-ratio feedback to the ECU to support stable combustion control and lower emissions.

Key Features

• Fits 2015-2018 Ford Focus, downstream
• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated oxygen sensor design
• Specific fit with 4-wire harness and 4-pin connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Wiring harness included; harness length measures 26.6 in
• Metal housing with high-temperature-resistant construction

Product Details

Bosch 16148 is part of the Bosch Actual OE Oxygen Sensor line, a product line focused on OE-style replacement sensors built from Bosch’s long-running oxygen sensor development. This downstream sensor uses a heated narrow-band design to help the engine control module monitor exhaust oxygen content and maintain closed-loop fuel control after the catalytic converter. For Ford Focus owners searching for a downstream oxygen sensor, Bosch 16148 offers the OE-proven sensor architecture associated with Bosch factory supply experience.

With a threaded 18 mm mounting design, rectangular male connector, and female terminals, this sensor is configured for direct replacement on the listed Ford Focus applications. The steel finish, metal housing, and ceramic sensing element are selected for durability in high heat and vibration environments. Bosch 16148 is also a strong match for shoppers looking for a 2015 Ford Focus downstream oxygen sensor, 2016-2018 Ford Focus O2 sensor replacement, or a Bosch 16148 oxygen sensor for Ford Focus emissions repair.

Common Issues This Part May Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate exhaust oxygen readings
• Rough fuel control after catalytic converter monitoring faults
• Emissions test failure tied to sensor response issues
• Sensor degradation from heat, vibration, or age

Installation Notes and Tips

Confirm the downstream sensor location before installation and match the connector shape, wire count, and thread size to the original unit. Use proper oxygen sensor service tools for removal and installation, and inspect the harness routing to keep it away from exhaust heat and moving components. Verify the connector locks fully and clear any stored fault codes after replacement.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Bosch Actual OE Oxygen Sensor line is engineered to deliver OE-proven fit and performance for emissions control service.