Keep your engine's air-fuel control accurate and your emissions system in check with the Walker Products Oxygen Sensor 350-34939. It installs as a direct-fit replacement across a wide GM lineup, including the 2016-2019 Buick Cascada, 2013-2019 Cadillac ATS, 2014-2019 Chevrolet Silverado 1500, 2016-2024 Chevrolet Camaro, 2017-2021 GMC Acadia, and 2015-2020 GMC Yukon — see the Buyer's Guide tab for the full list of 83 applications.
An oxygen sensor measures the oxygen content in the exhaust stream and sends a voltage signal to the engine control module, which uses it to trim the air-fuel ratio. This part is cataloged for upstream and downstream positions (including downstream left and right) depending on the application, so confirm the correct location for your vehicle before ordering.
Interchange: CTK-OSCH4014 · CTKOSCH4014
Manufacturer part number 350-34939 (also 35034939).
This part cross-references / interchanges with the following part numbers:
What does this oxygen sensor do?
It measures the oxygen content of the exhaust and sends a voltage signal to the engine control module, which uses that reading to adjust the air-fuel ratio for the listed applications.
Is this an upstream or downstream sensor?
This part number is cataloged for upstream and downstream positions, including downstream left and right, depending on the application. Confirm the correct location for your vehicle in the Buyer's Guide before ordering.
Will it fit my vehicle?
It's a direct-fit replacement for 83 GM applications, such as the 2016-2019 Buick Cascada, 2013-2019 Cadillac ATS, and 2014-2019 Chevrolet Silverado 1500. Check the Buyer's Guide tab for the full list.
What are signs this sensor may need replacing?
An illuminated check engine light, reduced fuel economy, rough idle, or a failed emissions test can be signs. Have the cause diagnosed first, since these symptoms can come from other issues.
What interchange numbers does it replace?
It cross-references CTK-OSCH4014 (also listed as CTKOSCH4014). Its own manufacturer part number is 350-34939.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
