Cut Power to the Battery (Hard Reset)
If the warning lights are on, clearing the ECU will reset any stored fault codes and turn them off momentarily.
Cons: The ECU will not remember any changes made to idle speed, throttle position, or fuel trim.
When a Toyota's engine isn't drivable, the Check Engine (CEL) light and Traction Control (TRAC) light will often both come on at the same time. As soon as the electronic control unit detects abnormal engine power, such as misfiring or stalling, traction control can be disabled.
P2401 + emission-related codes, most likely in the EVAP system, were the ones that AutoZone used to provide.
Failed EVAP Vent Solenoid/Purge Valve
A malfunctioning vent solenoid is the source of the P2401 code.
Rough idling and stalling can be caused by a blocked purge valve.
Steam Leaks These symptoms can be caused by any broken hose that connects the EVAP system to the intake manifold or the throttle body.
Restored MAF sensor Instead of carb cleaner, use the correct MAF cleaner.
Thoroughly scrub the throttle body Specifically, the plate and the passive air spaces around it.
Evaluate components of EVAP
Vent solenoid and purge valve operation.
Look for breaks or separations in the hoses.
To find vacuum leaks, while the engine is idle, spray carb cleaner around the hoses; if the RPM changes, the leak is located.
Allow the vehicle to idle for ten to fifteen minutes after cleaning so it can retrain itself on the proper throttle and idle positions.