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Thank you for trusating us with your questions. Can you verify the code number, please? P03300 is not a valid code.
The Avalon car line began in 1995, what year is yours?
There is no 1991 Avalon. Avalon began in 1995. In 1991, you wouldnt get a 4 digit code. Can you verify the year of the vehicle?
This code is for the knock sensor. This sensor monitors for spark knock during engine operation and the computer uses that to retard the timing to reduce the pre ignition. Unfortunately, the sensor is located under the intake manifold and takes quite the effort to get to it. Most of the time, when we see this code, a small critter has climbed into the engine bay and chewed up some wires under the intake manifold. However, there are only 2 ways to know for sure. First is to remove the intake manifold and check the wires visually. The other way is to use an inspection camera that uses a tiny camera on the end of a flexible wire to see down into that area. This is a specialty tool that most people just don't have.