Skip the auto shop - Our mechanics make house calls

Q: Engine light coming on

asked by on

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

A: Hello. Code P0446 comes up due to a problem...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: P0193 in Ford fiesta durateq

Hello. Trouble codes P0191 and P0193 are the trouble codes for issues with the fuel rail pressure circuit range, reading excessively high. It may be possible that the fuel rail sensor or circuit is having an issue. I would test...

Q: Excessive white smoke out of crankcase tube. Fuel in oil

That is definitely the result of a loss of oil pressure. A very bad oil leak, failed pump or lack of maintenance can be big trouble for an engine especially with such high miles. As long as there is no...

Q: Hello I just wanted to know what could be the problem with my car I have a 2004 Kia Rio and it stalls I thought it had a bad fuel

Hi there. Typically, a vehicle will start and then quit because of an issue with the fuel or electrical system. It is important to monitor fuel levels as well as warning lights which can signal to the driver that a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.