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Boxer54, Toyota Technician
Category: Toyota
Satisfied Customers: 1755
Experience:  ASE Master tech with L1 certification, Toyota Master Diagnostic Technician
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Getting a check engine light on. Code says P03300 NOx

Customer Question

Getting a check engine light on. Code says P03300 NOx sebnsor, bank 2.
JA: Does the light stay on, or does it blink? What is the model/year of your Toyota?
Customer: 1991 Avalon
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I'm not an auto mechanic but was hoping I could maybe try. Reading on internet, sounds like maybe take to a qualified mechain
Submitted: 1 year ago.
Category: Toyota
Expert:  Boxer54 replied 1 year ago.

Thank you for trusating us with your questions. Can you verify the code number, please? P03300 is not a valid code.

Customer: replied 1 year ago.
code is P0330, mistyped
Expert:  Boxer54 replied 1 year ago.

The Avalon car line began in 1995, what year is yours?

Customer: replied 1 year ago.
Expert:  Boxer54 replied 1 year ago.

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?

Customer: replied 1 year ago.
Expert:  Boxer54 replied 1 year ago.

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.