Bosch 16790 Oxygen Sensor - Downstream or Downstream Rear

Bosch Actual OE Oxygen Sensor for BMW

Bosch 16790 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in BMW applications that require an OE-style downstream sensor.

Compatible with 2008-2010 BMW 535i, downstream; 2009-2010 BMW 535i, downstream rear; 2009-2010 BMW 535i xDrive, downstream; and 2008 BMW 535xi, downstream. This Bosch Actual OE Oxygen Sensor is a direct-fit replacement for the listed positions and uses a threaded mounting design with a round female connector.

Key Features

• Bosch Actual OE Oxygen Sensor, part number 16790
• Narrow-band heated sensor for closed-loop fuel control
• Specific-fit design with wiring harness included
• 4-wire, pin-terminal construction with round connector
• Threaded 18 mm mounting with 22 mm hex size
• Metal housing for high-temperature and vibration resistance
• Wiring harness length: 17.6 in; overall length: 20.9 in

Product Details

Bosch 16790 uses switching-type oxygen sensing technology to measure exhaust oxygen content and relay accurate feedback to the engine control unit. Bosch developed this sensor line from its OE oxygen sensor history, including planar narrowband designs that improve light-off speed and closed-loop response. For BMW 535i, 535i xDrive, and 535xi downstream locations, the sensor is built to match the listed fitment and electrical connection requirements.

This part cross-references Bosch 16790 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Rough idle or unstable combustion control from a failing downstream sensor
• Emissions test failure caused by degraded sensor response
• Slow closed-loop operation after sensor aging or heat damage

Installation Notes

Verify the vehicle position before installation: downstream or downstream rear, depending on application. Confirm the 18 mm thread size, 22 mm hex, and 4-wire connector match the original sensor. Inspect the exhaust manifold or exhaust pipe threads for damage and ensure the harness routing follows the factory path to avoid heat and vibration exposure.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-style replacement backed by more than five decades of oxygen sensor development and production experience. The design uses ceramic sensing elements, controlled heating, and high-temperature materials to maintain consistent signal output under demanding exhaust conditions.