Walker 350-34543 Oxygen Sensor - Downstream, Downstream Front or Downstream Left

Walker 350-34543 Oxygen Sensor for Audi and Volkswagen

Walker Products 350-34543 is a heated oxygen sensor built as an OE-style replacement for specific Audi and Volkswagen applications. It is engineered for the correct fitment position and ECU feedback on downstream left, downstream, and downstream front locations across select performance and luxury models.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific fit for the listed vehicle applications
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper harness connection
• 24.13 in. wiring harness length and 27.68 in. overall length
• Walker Products Aftermarket engine management sensor line

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed for OE replacement use. Part number 350-34543 is built for the exact application and sensor position required by the vehicle, helping the ECU receive the correct diagnostic signal from the exhaust stream. This sensor is listed for Audi A8 Quattro, S6, S7, S8, RS7, A3 Quattro, RS4, and Volkswagen Eos, R32, and Passat applications in downstream left, downstream, and downstream front positions.

Fits 2015-2018 Audi A8 Quattro, downstream left. Fits 2015-2018 Audi S6, downstream left. Fits 2015-2018 Audi S7, downstream left. Fits 2015-2018 Audi S8, downstream left. Fits 2015-2018 Audi RS7, downstream left. Fits 2012-2014 Audi A8 Quattro, downstream. Fits 2013-2014 Audi A8 Quattro, downstream left. Fits 2014 Audi RS7, downstream left. Fits 2013-2014 Audi S6, downstream left. Fits 2013-2014 Audi S7, downstream left. Fits 2013-2014 Audi S8, downstream left. Fits 2006-2009 Audi A3 Quattro, downstream left. Fits 2007-2008 Audi RS4, downstream left. Fits 2007-2008 Volkswagen Eos, downstream front. Fits 2008 Volkswagen R32, downstream left. Fits 2006-2007 Volkswagen Passat, downstream front.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust feedback
• Higher fuel consumption from incorrect air-fuel monitoring
• Increased exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Confirm the sensor position, connector style, and thread size before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. For Audi A8 Quattro, S6, S7, S8, and RS7 applications, verify whether the vehicle calls for downstream left or downstream placement before ordering Walker 350-34543.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. The 350-34543 oxygen sensor is produced to support the diagnostic feedback expected by the ECU in the listed applications.