Photo 1 of 12671387 Upstream NOx Sensor Nitrogen Oxide Sensor Compatible with Chevy Express GMC Savana Sierra 2500 3500 4500 Silverado GMC Sierra 2500HD 3500HD 6.6L 5WK96645H 5WK96631H

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Photo 1 of 12671387 Upstream NOx Sensor Nitrogen Oxide Sensor Compatible with Chevy Express GMC Savana Sierra 2500 3500 4500 Silverado GMC Sierra 2500HD 3500HD 6.6L 5WK96645H 5WK96631HPhoto 2 of 12671387 Upstream NOx Sensor Nitrogen Oxide Sensor Compatible with Chevy Express GMC Savana Sierra 2500 3500 4500 Silverado GMC Sierra 2500HD 3500HD 6.6L 5WK96645H 5WK96631H