Skip the auto shop - Our mechanics make house calls

Q: Problem with emission control code P0440 Check Engine Light. Is that a major problem and how do you fix?

asked by on

is this a major fix where is the value located to fix?

My car has 1043270 miles.
My car has an automatic transmission.

Hi there,

A P0440 code is stored for an emission related fault; evaporative emission control malfunction. The evaporative emission system is responsible for preventing the release of fuel vapor into the atmosphere. When there is a fault in the system, it sets a corresponding code. This code could be the result of a mechanical or electrical malfunction. Electrical being a fuse, wiring, vapor sensor, or switching valve fault. Mechanical being a switching valve, mechanical valve, or a simple gas cap fault. This will not affect the vehicle’s performance, but needs to be addressed especially if you live in an area that performs emission inspections. Your mechanic has several available technicians to assist you with a Check Engine Light inspection and provide you with a detailed estimate and direction of 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!
  • Home
  • Questions
  • Problem with emission control code P0440 Check Engine Light. Is that a major problem and how do you fix?

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: a rattling noise from my engine when i accelerate and my engine light keeps on flickering ever since. safe to take it on a trip?

With the running description you gave you should not drive it long distance if you are getting engine noise and check engine light flashing. The problem may be low oil pressure or another issue with a sensor. Have the vehicle...

Q: Car overheated and rattling

Hi. Overheating is a serious issue and can cause significant damage to the engine such as breaking the head gasket or even damaging the cylinders and pistons. You should have a certified technician, such as one from YourMechanic, inspect the...

Q: Has a rough idle with no CEL on

I would try and have the fuel injectors and throttle body cleaned out. This should clean out injectors and intake valve carbon deposits that can cause the rough idle. If after driving the vehicle, and the CEL comes on, then...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...