To ensure reliability, purchase GM part # 12657188 Sensor Assembly, Heated Oxygen (Post, Catalyst Bank 1. It is sometimes referred to as GMC Oxygen Sensor. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific GMC Savana, Sierra, Yukon models.
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