Bosch 16227 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 16227

Bosch 16227 is an Actual OE oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a narrow-band heated downstream sensor for specific Audi applications, including Audi A8 Quattro models, with OE-style performance and fit.

Key Features

• Specific-fit Bosch oxygen sensor for direct replacement use
• Narrow-band heated design for stable closed-loop operation
• 4-wire configuration with blade terminals and male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for a cleaner replacement on the vehicle
• Steel-finish, metal-housing construction for high-temperature service

OE-Style Sensor Design

As part of Bosch’s Actual OE Oxygen Sensor line, part number 16227 reflects Bosch’s long OE development in switching-type oxygen sensors. Bosch uses ceramic sensing elements, controlled heater operation, and heat-resistant materials to maintain accurate lambda feedback under demanding thermal and vibration conditions. For Audi A8 Quattro downstream service, Bosch 16227 supports consistent fuel-control response and emissions monitoring.

This part cross-references 07P906265C for the same application.

Vehicle Fitment

• Fits 2014 Audi A8 Quattro, downstream, cylinder(s) 8, 10, and 12.
• Fits 2012-2013 Audi A8 Quattro, downstream, cylinder(s) 7-9.

What It Helps Address

• Check engine light concerns related to downstream oxygen sensor performance
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop operation after sensor aging or contamination
• Emissions test failures tied to oxygen sensor response issues
• Rough combustion control caused by inaccurate lambda readings

Installation Notes

Confirm the downstream location and cylinder-bank application before installation on the Audi A8 Quattro. The sensor uses an 18 mm thread and a threaded mount, so the exhaust bung threads should be clean and undamaged before fitting. Route the harness away from exhaust heat and moving components, and verify the connector orientation matches the vehicle harness.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and aftermarket supply built around the same engineering standards used by vehicle manufacturers. Bosch 16227 is made for direct-fit replacement on the listed Audi A8 Quattro applications.