Bosch 18052 Oxygen Sensor - Upstream or Upstream Right

Bosch Wideband Oxygen Sensor for Precise Air-Fuel Control

Bosch Validated Oxygen Sensor 18052 is a direct-fit wideband A/F oxygen sensor built for accurate air-fuel ratio measurement across the full lambda range. It provides the ECU with detailed feedback for cleaner combustion, stable drivability, and consistent emissions control in demanding operating conditions.

Compatible With select Audi, Hyundai, Fiat, and Dodge applications, including Audi Q7, Audi A6 Quattro, and Hyundai Sonata upstream positions. Bosch part number 18052 is engineered as a standard replacement for vehicles that require a heated wideband sensor with a factory-style connector and harness.

Key Features

• Wideband A/F oxygen sensor for continuous, high-precision mixture monitoring
• Heated design for faster light-off and stable operation
• Specific-fit replacement with included wiring harness
• 5-wire design with 6 terminals and rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Robust metal housing and ceramic sensor construction
• Bosch Validated Oxygen Sensor line backed by OE development experience

Detailed Description

Bosch 18052 uses wideband sensor technology to measure air-fuel ratio more precisely than a traditional switching O2 sensor. That added resolution helps the engine control module manage fueling during idle, acceleration, cruise, and load changes. The result is more consistent operation for vehicles such as Audi A6 Quattro, Audi Q5, Audi Q7, and Hyundai Genesis Coupe applications that rely on upstream mixture feedback.

The Bosch Validated Oxygen Sensor line reflects Bosch’s long OE development history and its role in advancing planar pump-cell wideband design. This sensor is built for direct replacement service with a threaded mount, steel finish, and harness length of 23.6 inches. Part number 18052 is also referenced for select OE numbers, including Bosch-style cross references such as 4L0906262K and 06E906265AJ.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Rough idle or hesitation caused by inaccurate mixture feedback
• Reduced fuel economy from poor fuel control
• Elevated emissions from delayed or unstable sensor response

Installation Notes and Tips

Install Bosch 18052 in the upstream position only where listed in the fitment data. Verify connector shape, terminal count, thread size, and harness length before installation. Because this is a specific-fit sensor, compare the original sensor routing and connector style to the vehicle application before final assembly. Use proper oxygen sensor service tools to avoid damaging the threaded bung or sensor body.

Fits 2017-2019 Audi Q7, Upstream; 2009-2018 Audi A6 Quattro, Upstream; 2012-2018 Audi A7 Quattro, Upstream; 2015-2018 Audi A8 Quattro, Upstream; 2010-2017 Audi Q5, Upstream; 2015-2017 Audi S5, Upstream; 2010-2013 Audi S5, Upstream; 2014-2017 Audi SQ5, Upstream; 2012-2017 Fiat 500, Upstream; 2015-2016 Audi S4, Upstream; 2010-2013 Audi S4, Upstream; 2011-2015 Audi Q7, Upstream Right; 2013-2014 Dodge Dart, Upstream; 2013-2014 Hyundai Genesis Coupe, Upstream; 2009-2011 Audi A6, Upstream; 2008-2010 Audi A5 Quattro, Upstream; 2010 Hyundai Elantra, Upstream; 2010 Hyundai Sonata, Upstream; 2009 Audi Q5, Upstream; 2009 Hyundai Elantra, Upstream.

Quality Assurance

Bosch supplies this oxygen sensor as part of its validated aftermarket line, drawing on more than five decades of OE development in engine management and emissions technology. Bosch 18052 is built to OE-style standards for accurate signal output, reliable heater performance, and durable service in high-temperature exhaust environments.