Skip the auto shop - Our mechanics make house calls

Q: Trying to pass emissions test. Failed once. Code P0449

asked by on

Trying to pass emissions test, failed, code P0449 showed up. Changed charcoal canister, vapor canister vent solenoid, gas cap, cleaned corrosion out of EVAP electrical connection cleared code and light came back on after 25KM, cleared and comes up yellow. Not passing emissions My car has 94000 miles.
My car has an automatic transmission.

A: Hello, thank you for writing in. Code P0449...

Hello, thank you for writing in. Code P0449 will set when the system sees that the position of the vent valve, and the voltage for its position, do not match. There could be a wiring problem, a faulty hose, or a failed component. The code only gives a general idea of the area affected, so that a certified mechanic knows where to start a diagnostic procedure. The mechanic should have the specialty tools and techniques to pinpoint what exactly is causing the issue. If you need help identifying and repairing the issue, offers several options. We have trained mechanics that can come to your home, or place of business, and perform the diagnosis and repairs for you.

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 shift into drive or reverse. How do I fix this?

The first thing I would suggest is checking your transmission fluid level. It's very easy on your vehicle. Start the engine and allow it to idle in park for about 30 seconds. Under the hood towards the back of the...

Q: Why is my 2003 Honda Accord overheating? Could this be the reason?

First we must differentiate between the radiator cap and the coolant overflow reservoir cap. Most coolant overflow reservoir's don't have rubber on their caps, for this reason am not sure if your are describing the reservoir cap or the radiator...

Q: I am leaking antifreeze

Hi, thanks for your question. I'd be happy to help. You can make a note of where you notice the leak, then have a mechanic come to pressurize the cooling system and isolate the leak for you. The water pump...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...