Lexus Troubleshooting Questions? Ask a Lexus Expert
Hello, my name is***** the Vacuum Switching Valve (VSV) for the pressure sensor (located on the canister) operates correctly. This is a normally closed (N.C.) valve. When energized, it should open. When de-energized, an internal spring should close the valve. If it sticks open, code P0446 will set. This is the most common part to fail, let me know how it goes or if you have more questions. Thanks.