Description: Egr valve, vapor canister and sensors. 3.4L, egr valve. 6 cylinder. 3.1L, upper. Egr valve & sensors, 3.1L. 3.4L, upper. 3.4L, 2000-01. Helps provide a leak-free seal Allows exhaust pollutants to enter the engine for re-burn Helps the engine emission system operate properly This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors