Most check engine lights are associated with the emissions system. These codes indicate an "evap" , or evaporation leak. The most common cause of this is not tightening the gas cap completely. Most click a couple of times when you replace the cap after gassing up. Try to notice when the light comes on and whether it goes off after a while. After the appropriate drive cycle after fueling, it mat go out until next time. The leak could be somewhere else in the system, and if comes on and stays on, you should take it to a shop and have it checked.
〉 Answered on Jul 12th, 2014 by Gail Dunn, Owner at Women's Automotive Connection
P0446 Toyota - EVAP System Vent Control Circuit
P0442 ï¿½ Small EVAP system leak detected
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve
〉 Answered on Jul 12th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at
Hi Kenny, On your 2003 Toyota: This could be as simple as a loose gas cap. Check the gas cap and have your favorite shop clear the codes and see if the codes come back. These codes are emission related and will need to be addressed for the vehicle to pass smog or emission testing. Good Luck.
〉 Answered on Jul 12th, 2014 by Maryann Croce, Owner at Croce’s Transmission Specialists