Check engine light

Thats a personal decision.

446 is an evap code.

CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for Canister Closed Valve (CCV), VSV for pressure switching valve are used to detect abnormalities in the evaporative emission control system.

The ECM decides whether or not there is an abnormality in the evaporative emission control system by the vapor pressure sensor signal.

DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in Fig. 1, or when there is a malfunction in the VSV for EVAP, the VSV for pressure switching valve or in the vapor pressure sensor itself.

Wiring Diagram

INSPECTION PROCEDURE

HINT:
If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTC P0441, P0446, P0450 or P0451. If no other malfunctions than them are detected, troubleshoot DTC P0440 next.
Read freeze frame data using the TOYOTA hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. At the time of the malfunction.

First thing I would check for is an air leak such as on the snorkel going to the throttle body. Also check the oil cap, dipstick and pcv valve for proper seating. The first code is probably the result of the second one.
However the strategy is to check the po171 first. It isn't as simple as just replacing a part based on a code as autozone would like you to think.

According to Mitchell 1:

Since the problem happens in warm weather. I would lean towards testing the ECT as well as checked the the air leak.

A bad sensor may prevent the system from going into closed loop, and usually causes the fuel mixture to run rich causing an increase in fuel consumption and emissions.

Check the compression and injectors for those cylinders

The shaking means the engine is misfiring and it is likely the result of ignoring the Check Engine light. When it turns on that means the Engine Computer detected a problem, often before it turns serious, and it set a diagnostic fault code to tell you what that problem is. The place to start is by having the code(s) read and recorded. They will indicate the circuit or system that needs further diagnosis.

Hi,

By chance, do you know what codes were retrieved?

Do me a favor. We missed this post because it was added on to a Rav 4 post. I need you to repost your question as a new one. We try to keep the posts specific to one type of vehicle and problem, so it is more helpful to others.

Here is the link to start a new thread. Simply copy and paste your question into a new one. Also, please provide codes if you know them because what you described doesn't make sense as far as what is happening.

https://www.2carpros.com/questions/new

I hope you understand. I will watch for your new post.

Joe