Bosch 16046 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor for BMW

Bosch 16046 is a narrow-band heated oxygen sensor built for downstream use on select BMW applications. It provides precise air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions across changing operating conditions.

As part of Bosch’s Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long-running OE development in oxygen sensing technology, including faster light-off, improved lambda accuracy, and quicker closed-loop operation. It is a specific-fit, threaded replacement with a 4-wire harness and a rectangular male connector for direct application matching.

Key Features

• Part number 16046 Bosch Actual OE Oxygen Sensor
• Narrow-band heated oxygen sensor for downstream placement
• Specific fit with threaded mounting
• 4-wire design with included wiring harness
• Blade terminals, rectangular male connector, male terminal gender
• Metal housing with high-temperature-resistant construction
• 18 mm thread diameter and 22 mm hex size
• Wiring harness length: 18.8 in; overall length: 22.1 in

Product Details

Bosch 16046 uses advanced ceramic sensing elements and optimized heater control to deliver consistent signal output under heat and vibration. This narrow-band heated O2 sensor is engineered for accurate downstream monitoring on BMW models that rely on OE-style emissions feedback. If you are replacing a worn sensor on a BMW 335i, BMW X5, or BMW M2, this Bosch oxygen sensor supports the factory control strategy with the same type of sensing architecture used in OE applications. This part cross-references Bosch 11787645875 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Erratic air-fuel ratio feedback to the ECU
• Reduced emissions control efficiency
• Slow closed-loop response after sensor aging
• Downstream sensor faults on BMW turbocharged applications

Installation Notes

Fits 2014-2015 BMW 335i, Downstream; 2014-2015 BMW 335i xDrive, Downstream; 2014-2015 BMW ActiveHybrid 3, Downstream; 2014-2016 BMW 435i, Downstream; 2014-2016 BMW 435i xDrive, Downstream; 2015-2016 BMW 435i Gran Coupe, Downstream; 2015-2016 BMW 435i xDrive Gran Coupe, Downstream; 2015-2016 BMW ActiveHybrid 5, Downstream; 2014-2016 BMW M235i, Downstream; 2015-2016 BMW M235i xDrive, Downstream; 2016-2018 BMW M2, Downstream; 2017 BMW 535i GT, Downstream; 2017 BMW 535i GT xDrive, Downstream; 2017-2018 BMW X4, Downstream; 2017-2018 BMW X6, Downstream; 2014-2018 BMW X5, Downstream; 2018 BMW 640i, Downstream; 2018 BMW 640i xDrive, Downstream; 2018-2019 BMW 640i Gran Coupe, Downstream; 2018-2019 BMW 640i xDrive Gran Coupe, Downstream.

Confirm connector shape, wire count, thread size, and downstream location before installation. Use the existing harness routing and mounting point to avoid strain on the sensor lead. Bosch 16046 is a direct replacement for the listed BMW applications and should be matched to the vehicle’s original sensor position.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions sensing. The Actual OE Oxygen Sensor line is built to OE-proven standards for accuracy, durability, and consistent operation in demanding thermal conditions.