What is the average cost to replace the knock sensor on a 2000 Toyota Avalon?

Replacing the knock sensor on a 2000 Toyota Avalon is about $425 to $700 depending on the local labor rates in Your area. The sensor itself can cost $300 to $450 depending on what brand of part You go with and then You will be looking at $125 to $250 in labor. The knock sensor is fairly tricky to get to because it is beneath a lot of components on the side of the engine, but it is an important sensor. It helps detect knocks in the engine and can adjust fuel and timing to help reduce them when they do happen. If You have a failed sensor You will usually get a check engine light at Your dash letting You know that it has failed.