Q: Q: Engine light coming on

asked by on

The Engine light is on. The diagnostic said it was an EVAP issue, error code P0446.

Hello. Code P0446 comes up due to a problem with the EVAP emissions vent system. This system collects evaporating fuel so that it does not get released into the atmosphere. The code almost always means that the vent valve has failed. A mechanic would remove this valve and test it to see if it is functioning. If it functions with power applied to it, then it may be a circuit problem, but that is not as common. The best way to diagnose it is with a scan tool that allows you to cycle the vent valve to check its function. A certified mechanic, like one from YourMechanic, can inspect the engine codes present in the computer and diagnose what is causing the problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Engine light coming on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car is having problems shifting into reverse

Manual transmissions use a reverse lockout to prevent the car from going into reverse when the car is moving forwards. Sometimes these lockouts can fail and cause the symptoms you have described. Other possible causes are the reverse synchros inside...

Q: Q: My check engine light is on

A vehicle that has a problem with the engine or power train can turn on the check engine light and set a code in the computer. The list of possible codes and problems are in the hundreds. You will need...

Q: Car tries to die when I give it some gas.

A unmetered air leak can cause this symptom of the engine sputtering or dying on acceleration. Rubber intake boots and vacuum lines need to be checked for leaks. If no obvious leaks are detected then the intake system may need...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...