Oxygen O2 Sensor 34-4940 Upstream 234-4974 Downstream Compatible with GMC Sierra Chevy Silverado 1500 2014-2017, Chevy Suburban, Tahoe, GMC Yukon 2015-2018 Set of 4

Product Description:Why Choose Us?O2 Sensors Solve the problems of unstable idle, frequent stalling, and poor acceleration in your car1. To restore fuel efficiency and reduce wasted gas.2. To improve engine smoothness, acceleration, or idle quality.Fitment:Compatible with GMC Vehicle for GMC Sierra 1500 4.3L/5.3L/6.2L 2014-2017for GMC Yukon and Yukon XL 5.3L/6.2L 2015-2018Compatible with Chevy Vehicle for Chevy Silverado 1500 4.3L/5.3L/6.2L 2014-2017for Chevy Suburban 5.3L 2015-2018for Chevy Tahoe 5.3L 2015-2018Replace Number: Upstream Sensor— 234-4940, 12666612, 21581, F00HL00421, 18187, 12657188, Downstream Sensor— 234-4974, 12655678, 21075, 12661898, 12643708, F00HL00410, 18054

• Fitment: O2 sensor Compatible with 2014-2017 GMC Sierra 1500 4.3L/5.3L/6.2L; 2015-2018 GMC Yukon and Yukon XL 5.3L/6.2L; Chevy Silverado 1500 4.3L/5.3L/6.2L 2014-2017; Suburban 5.3L 2015-2018; Tahoe 5.3L 2015-2018
• Replace Number: Upstream Sensor: 234-4940, 12666612, 21581, F00HL00421, 18187, 12657188; Downstream Sensor: 234-4974, 12655678, 21075, 12661898, 12643708, F00HL00410, 18054
• Why Choose Us: Oxygen sensor helps prevent catalytic converter damage, restores fuel efficiency by reducing wasted fuel, and improves overall engine performance with smoother idle and better acceleration
• High Quality Materials: O2 sensor upstream downstream featuring 310S stainless steel fastening nuts for reliable operational stability, a sealing gasket with exceptional sealing performance, and a coated threaded surface that significantly extends service life.
• Please note: Check your vehicle information and verify that the OE part number, connector style, and length match those of the original part on your car. We offer a 12-month warranty for quality-related issues.