Your vehicle deserves only genuine OEM GM parts and accessories. To ensure reliability, purchase GM part # 12643707 Sensor Assembly, Heated Oxygen (Pre, Catalyst B2S1). It is sometimes referred to as Chevrolet Oxygen Sensor. Our GM parts and accessories are expedited directly from authorized GM dealers strategically located all across the U.S. and are backed by the manufacturer's 12 month, 12,000 mile warranty. OEM GM parts are the best for restoring your vehicle to factory condition performance. This part fits specific Chevrolet Blazer, Impala, Silverado models.
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