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Brand New Technical Service Bulletin Repair Kit (89060413-TSB2) Includes:2 General Motors Knock Sensors1 Set of General Motors Upgraded Green Intake Manifold GasketsTube of Silicone RTV Sealant (Permatex)Intake Manifold Mounting Bolts Sold Seperately; See APDTY 112685This kit is designed to repair TSB 02-06-04-023A & 02-06-04-023 and/or DTC (diagnostic trouble code) PO332. GM has identified a moisture intrusion problem on the rear bank knock sensor on 4.8L, 5.3L, & 6.0L engines. The repair procedure has been outlined by General Motors and requires removing the upper intake manifold, replacing the rear knock sensor or both knock sensors, RTV'ing the area to prevent water intrusion, then installing new upgraded gaskets, & clearing any trouble codes.The included upgraded GREEN gaskets and new intake bolts ( Bolts not included & sold seperately; See APDTY 112685) are designed to prevent vacuum leaks that are also very common on these engines