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Lambda Oxygen Sensor Up+Downstream 234-4256 234-4668 Oxygen O2 Sensor For GMC For Yukon 6.2L For Sierra 1500 2500 3500 HD 6.0L Lambda Sensor Oxygen sensors have a simple structure, quick response, and are easy to maintain and use. They can improve efficiency and save fuel. Oxygen sensors are key to efficient engine operation. Replacing a faulty sensor can significantly improve fuel... Lambda Oxygen Sensor Up+Downstream 234-4256 234-4668 Oxygen O2 Sensor For GMC For Yukon 6.2L For Sierra 1500 2500 3500 HD 6.0L Lambda Sensor