4 Piece O2 Oxygen Sensor SetKit Includes(4) O2 Oxygen SensorsFitmentCompatible with: 2009-12 Chevrolet Colorado V8 5.3L Upstream & DownstreamCompatible with: 2009-12 GMC Canyon V8 5.3L Upstream & DownstreamCompatible with: 2008-10 Hummer H3 V8 5.3L Upstream & DownstreamCompatible with: 2009-10 Hummer H3T V8 5.3L Upstream & DownstreamProduct AttributesQuantity: 4 PieceProduct Features Application Specific Design: No modifications and pre-calibrated Isotatic-pressed and plasma-sprayed for extended service life Double-Layered 310S Stainless Steel: Additional protection from moisture and debris Restored Engine Performance: Improved fuel economy and lower emissionsItem DetailsTRQ oxygen sensors are manufactured to precise specifications using premium raw materials to optimize your vehicle’s emission system. Each sensor is isostatically-pressed for improved strength and durability, and plasma-sprayed to improve sensitivity and prolong the service life of the sensors. Oxygen sensors wear out over time and should be replaced every 60,000 miles to prevent poor engine performance. TRQ recommends replacing the oxygen sensors in sets to optimize fuel economy and reduce overall emissions. All products are fit and road-tested in our Massachusetts R&D facility to ensure we deliver on our promise of Trusted Reliable Quality.Reference NumbersACDelco: 12572705, 12580466, 12585999, 12589321, 12597989, 12609477, 12609949, 12612506, 12612571, 12615124, 12617332, 12637297, 12637298, 213-1161, 213-2956, 213-3544, 213-3866, 213-3913, 213-4215, 213-4350, 213-4408, 213-4703, 2131161, 25180901, 25182983BorgWarner: OS1820Bosch: 15130, 15150, 15282Delphi: ES20008, ES20352DENSO Auto Parts: 234-4243, 234-4561, 234-4669DENSO: 234-4236, 234-4243, 234-4246, 234-4249, 234-4337, 234-4348, 234-4526, 234-4567, 234-4773, 234-4774, DOX0301General Motors: 12 60 0893, 12 60 9477, 12572705, 12609949, 12611870, 12612571, 12617332, 19209816Isuzu: 8-19209-816-0, 8125859990Niehoff: FE80166, FE80806, FE80826, FE80838NTK: 21059, 21549, 21576Oextra: REA1193Omnicraft: QDY26, QDY70OMNIPARTS: 19060388Saab: 12 60 9477, 12629659, 19209816Standard Motor Products: SG1066, SG1621, SG1641, SG1653, SG1827Walker Products: 250-24491, 250-24703Wells: SU1516