Skip the auto shop - Our mechanics make house calls

Q: Check engine light is on with various codes.

asked by on

Check Engine light is on with codes P0440, P0441, and P0446.

Hello, all three of your codes are for the evaporative emissions system. The first thing to do is a good visual inspection of all the vacuum line from the intake manifold to the purge valve. Any torn rubber hose or cracked plastic hose will allow a vacuum leak and the test will not be able to be done properly. The hose going from the purge valve to the line going back to the task should also be inspected. The purge valve should also be tested, with vacuum applied to the engine side of the valve, the side going to the tank should have no vacuum applied to it with the solenoid not energized. The vacuum line connecting the purge line to the intake should be vacuum tested and should hold vacuum. If those check out, the fuel vapor system from the valve to the tank will need to be tested. This will need the aid of a mechanic with special equipment, so the shut off valve can be closed and a smoke machine can be connected to the system and inspected for a leak, by looking for smoke.

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

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: I bought a new battery from Walmart 2 months ago to replace the one I had. I went out to crank my van and it struggled to start.

If the battery is dead and it is only 2 months old then return it for replacement. Once you install the battery you should have the charging system checked by a mechanic like one from YourMechanic. The charging system should...

Q: I can hear the wheels rotating as I slow down.

Hi Kamesha. At 45,000 miles, and with the information you provided, I would first think that the sound may be coming from the brake pads. Not knowing what kind of sound the vehicle is making makes it kind of tough...

Q: I have hit a curve and flat my tire but I had to ride the rim home. I got a new tire but my car pulls to the right and left now

Hey there. Unfortunately, when you hit the curb you may have damaged the steering gear or the tie rod ends. You should have the suspension and steering checked to pinpoint the problem. If your car cannot be driven, then have...

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...
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...
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.