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・Save up to 30%

Get a quote

What others are asking

Q: Car won't start; possible battery problem

It is very possible that you have a bad battery. Batteries typically last 5 to 10 years and when they go bad they will not produce enough cranking amps to crank the car. I would recommend having a technician come...

Q: Car dies after charging battery

The symptoms described for your Mitsubishi Outlander lead me to believe you are dealing with a weak battery. As batteries age, they lose the ability to hold a charge. The Check Engine Light could be on as a result of...

Q: Can't get into gear after clutch and gearbox replacement

New gears in a new transmission will naturally be a bit stiff at first as the gears are freshly cut and have not been worn in as with the old transmission. However the issue of whining and not going into...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...