Q: Car failed smog check

asked by on

My car failed a smog check due to failed code P0440 (EVAP System) and code P0441 (System Incorrect Purge Flow).

A: Your gas tank contains an evaporative emiss...

Your gas tank contains an evaporative emissions system which prevents fuel vapors from entering the atmosphere. There are two major valves (purge and vent) which control this system in addition to a lot of hoses. Any one, or multiple, items may need replacement. The only way to correctly diagnosis this problem requires special equipment. A qualified technician, such as one from YourMechanic, can assist you in diagnosis and repair.

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

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: Transmission making grinding noise when downshifting

If your vehicle is a standard, you can have a bad synchronizer in your transmission. The synchronizers are typically made of brass and are what make shifting from one gear to the other smooth. When they wear they make shifting...

Q: Problem starting after fueling have to give it to start

Hello. All modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the...

Q: Car won't pass smog due to computer code P0420 - 2006 Volkswagen Rabbit

This code is related to the catalytic converter. As you may know, the catalytic converter is a section of your exhaust system that helps to complete the combustion process when excess unburnt fuel gases pass through the exhaust. Due to...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.