Skip the auto shop - Our mechanics make house calls

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.

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: Check Engine light P0304.

The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs...

Q: Code P0496.

This may be obvious, but have you cleared the code with the scanner? If so, disregard that first sentence. Codes will not clear immediately after the repair. With an emissions system code, there is also a drive cycle to be...

Q: P0442-EVAP System leak detected

Hi. The evaporative emissions (EVAP) system is used to prevent fuel vapor from escaping into the atmosphere. Code P0442 stands for EVAP system small leak detected. The cause of this code can be difficult to diagnose. It could be triggered...

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...
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...