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EVAP (Evaporative Emission Control) system

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Symptoms of a Bad or Failing Canister Purge Solenoid
Common signs of a problem with a car EVAP canister purge solenoid include rough idle, difficult starting, and the Check Engine Light turning on.
Symptoms of a Bad or Failing Evaporative Emission Control Canister
Common signs include the Check Engine Light coming on, raw fuel smell coming from the back of the car, and a collapsed or leaking fuel tank.
P0450 OBD-II Trouble Code: Evaporative Emission Control System Pressure Sensor Malfunction
Diagnostic Trouble Code (DTC): P0450 P0450 code definition If a vehicle has stored a P0450 code, it means there has been a malfunction with the evaporative emission control system pressure sensor....
P0451 OBD-II Trouble Code: Evaporative Emission Control System Pressure Sensor Range/Performance
Diagnostic Trouble Code (DTC): P0451 P0451 code definition When the PCM (powertrain control module) detects an incorrect, erratic, or otherwise improper voltage signal from the evaporative emission control system pressure sensor,...
P0457 OBD-II Trouble Code: Evaporative Emission Control System Leak Detected
Diagnostic Trouble Code (DTC): P0457 P0457 code definition When the PCM (powertrain control module) detects a leak in the evaporative emission control system, the P0457 code will be stored and the...
P0458 OBD-II Trouble Code: Evaporative Emission System Purge Control Valve Circuit Low
Diagnostic Trouble Code (DTC): P0458 P0458 code definition The P0458 code means that a specific part of the EVAP system purge control valve circuit has caused a voltage reading that does...
Is it Safe to Drive With an EVAP Leak?
While it is safe to drive with an EVAP system leak, it causes excess car pollution. Fixing the problem is often as simple as tightening the gas cap.
What Does the Fuel Cap Warning Light Mean?
The fuel cap light tells you when a leak has been detected in your car, most likely from a loose gas cap.
P0448 OBD-II Trouble Code: Evaporative Emission Control System Vent Control Circuit Shorted
P0448 code appears when the PCM detects that the circuit for the evaporative emission control system's vent has shorted or valve is stuck.
How to Replace an Evaporative Emission Control Canister
Emissions are regulated by the EVAP emission control canister which fails when the fuel tank gauge does not work or you fail an emissions test.
How to Clean Evaporator Drain Tubes
The air conditioning system on a car has evaporator drain tubes than need cleaning if there is dirty air in the car or it is not blowing consistently.
How to Replace a Canister Purge Solenoid
The canister purge solenoid prevents harmful vapor from releasing into the atmosphere. A faulty solenoid will not allow you to pass an emissions test.

Related questions

Question
I have a bent EVAP line that's bent underneath the car, how do I know if it's leaking? Also if it's not leaking is it ok to drive?
The car's self diagnostics should be able to tell you if there is a leak in the line, The EVAP monitor will pull a vacuum on the tank and keep track of the fall in pressure. It will light the...
Question
Hi my 07 charger failed smog , i had diagnostics done and i was told i need new evap canister and o2 sensor bank 2 sensor 2. Can y
Hello, thank you for writing in. To get an official quote, you will want to contact our service department. I can tell you that replacing the oxygen sensor can cost from $100-200. The evap canister can be more expensive, but...
Question
Does the car have to be driving down the road for the computer to sense a Fuel line EVAP leak?
In order for the EVAP system to complete the drive test you need to be at a cruise steady speed with engine warm and no check engine light on. The actual speed is needed will be in overdrive above 45...
Question
Where is purge valve for evap canister 07 honda civic si
The purge valve is mounted on the engine and you will see hose connections from the valve to the intake manifold as well as a wire harness connection. The purge valve should be tested to determine if it is actually...
Question
Where is the leak detection pump on a 2010 challenger rt
The leak detection pump is part of your car's evaporative emissions control system. The pump assembly is attached to the vehicle's vapor canister. To replace it you have to remove the retaining bolts and the 2 wire electrical connector to...
Question
Where is the fuel vapor leak detection pump located
The leak detection pump, also known as the EVAP system integrity module (ESIM), is Mopar Part No. 4861962AB for your car. The ESIM is an emissions control device and is typically mounted on the vapor canister in the rear of...
Question
Check engine light is on. The gas cap is okay and the vent sensor by crankcase seems okay too. What could it be?
The issue could be the evaporative emission vent purge valve on the vapor charcoal canister. I recommend using a sniffer that is used for butane and check for a fuel leak around the vent purge valve and see if there...
Question
Check Engine light on error code P0442
The code P0442 is the computer has detected a small leak in the evaporative system. You may have a leak in the seal of the fuel cap, pressure sensor leak or defective sensor, vapor valves or lines leaking slightly. You...
Question
Putting gas in a 2009 ford f150 and it won't crank after
You must have a leaking purge valve that is letting fumes that build up in the fuel tank when refueling the truck. Have the purge valve checked by applying vacuum to purge valve with the engine off to see if...
Question
The check engine light is on and it's say gas cap what price range am I lookin at to have it fixed
If you are referring to the warning light for a loose gas cap loose and/or Diagnostic Trouble Code P0442, a loose or defective gas cap is merely one possible reason for the warning light or the Code. You could have...
Question
How do you test a used vapor canister?
Hi there. Take an air hose and with using low pressure, blow air into the tank pipe and see if the air comes out of the other pipes with no restrictions. Then with using low pressure, blow air into the...
Question
My charcoal vapor canister is clogged. I have a 1997 toyota corolla. Is there a way to clean the canister or do i need to shell o
If you input your year, make and model at Car-Part.com and search on "vapor canister", you will find plenty of them used for $25 on up. A used canister will be fine and generally you get at least a brief...
Question
Can you tell me how to remove the charcoal canister in a 02 hyundai sonata 2.4l it needs the foam replaced
To remove the canister, perform the following: Remove the two bolts that hold the canister onto the car and drop it down. Then remove the bolts that secure the canister to the shield cover. Disconnect the wiring harness to...
Question
Check Engine Light on and off, reader gives P0446 error 1999 Toyota Corolla
Hello - the P0446 code is an indication that the evaporative emissions purge valve electrical circuit has had a loss of electrical power to the vent valve that allows fresh air to enter the evap cannister. This could be a...
Question
I have 2013 ford mustang and right now the check fuel check inlet just showed up what do I do now
The “check fuel fill inlet” warning light means that there is a problem with the fuel tank cap seal. The fuel cap could be missing, loose, damaged, screwed on too tightly and thus distorted, there is debris in the fuel...
Question
My car shows the check engine light, the computer showed code P0455, and it shakes and vibrates at stops and during acceleration.
First, remove and reinstall the gas cap, clear the code P0455, and drive the vehicle for a few days and see if the code comes back. If the code comes back on, then either the gas cap needs replaced...
Question
whining noise front of engine, EVAP and temperature control
Hello, thank you for writing in. The first two symptoms may be related. Finding a leak in the EVAP system will take some time and focus. If the noise goes away after fixing the leak, then we know we can...
Question
Code P0455 2004 Audi A4 2.0T
Hello - a P0455 indicates a large evaporative emissions leak. This problem code originates with the evaporative emissions system purge valve, which expects positive pressure flow from the evap emissions cannister - which captures fumes from the fuel tank primarily....
Question
Hey there! I can't seem to find the location of my canister purge valve on my 91 Chevy G20 5.7L 350
On these vehicles, the canister purge valve is typically located either on top of, or just in front of, the fuel tank. It has been my experience that they are most commonly found mounted to the top of the fuel...
Question
I have a 2004 Mercedes Benz ML350.
Hi there. Check the brakes and the wheel speed sensors to see if the are damaged or worn causing the ESP light to come on. A worn brake pad can cause the ESP light to come on as the wheel...

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