Evap system leak - If there is a small fuel vapor leak anywhere in the EVAP system, that can trigger a P0456 code. The common reason for any leak in the EVAP system is a problem with one or several parts of that system.

 
Apr 29, 2022 · If the purge valve leaks, it could trigger a P0455 or P0442 code, but it might also trigger a different EVAP code. If the purge solenoid is defective, replace it. Steps include removing the hoses and disconnecting the electrical connector. 3. Faulty Vent Solenoid Valve – P0442 or P0455. Vapor canister and fuel tank. . Tennessee vs florida prediction

Leak diagnostic unit. Air filter. Rollover valve. Float limit vent valve. Fuel filler pipe. All the lines connecting all components. The EVAP system has its own leak diagnostics that …The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Honda Fit’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a large leak in the …The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Chevy Cobalt’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a …Mar 11, 2022 · Since the gas cap is the biggest leak an EVAP system can have first check to see if the cap is tight and seals against the filler neck. Next remove the cap to inspect the cap O ring seal. This O ring is large and is subject to wear due to its constant removal when the tank is filled. Next, open the hood and look for the vacuum feed line from ... 1 16839/P0455/001109 - EVAP System: Large Leak Detected. 1.1 Possible Causes; 1.2 Possible Solutions; 1.3 Special Notes; 16839/P0455/001109 - EVAP System: Large Leak Detected Possible Causes. ... Possible Solutions. Check Gas Cap; Check EVAP System; Check to make sure EVAP purge valve is not installed …Apr 21, 2020 ... #2 · nd4spdbh Well-Known Member ... put some grease around the O ring on your gas cap that seals to the filler neck, clear codes. If they come ...The P0455 trouble code is a generic powertrain code, but not all manufacturers use it. This DTC indicates that there’s a significant leak in the EVAP system. It’s been reported with many brands, such as Chevrolet, Nissan, Jeep, Ford, and Dodge. I recommend double-checking what this code means according to your manufacturer.Sep 21, 2023 · The P0455 is just one of the engine codes that needs decoding. The P0455 code is a result of a large leak in an Evaporative Emissions Control System (EVAP). The purpose of that system is to keep the fuel fumes inside the fume lines. If there is a leak in the system, the fumes will end up in the atmosphere causing additional pollution. A power-steering fluid leak indicates part of the power-steering system is worn or damaged. The most common cause of a power-steering fluid leak is damaged tubing coming from or go...Mar 24, 2022 · Here are some common EVAP leak fault codes: P0455 – EVAP system gross leak detected. P0456 – EVAP system very small leak detected. P0442 – EVAP system small leak detected. P0440 – EVAP system malfunction. P0441 – EVAP system incorrect purge flow or flow during non-purge. P0457 – EVAP system leak detected (fuel cap) or EVAP canister. P0456 – EVAP System Very Small Leak Detected. P0457 – EVAP System Leak Detected (Fuel Cap) or EVAP Canister. How much can it cost to fix an EVAP issue? The cost of fixing an EVAP issue depends on the severity of the problem. If it is a component failure, it may be quick to fix and may have a low cost.Evap System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can ... a Stop/Start Not Ready message accompanied the CEL - turns out Stop/Start is disabled with an active CEL *Evap system passed leak tests *PCM update addresses nuisance P0456 code - reprogrammed to 68440959AC . Reactions: Htfan ...Aug 22, 2022 · The P0455 fault code indicates a large leak in the EVAP system. (Evaporative Emissions System) This could also be stated as a "gross leak". This fault code may lead you down the wrong path if not diagnosed properly. In some cases, a P0455 code can be an EVAP vent valve that is stuck open. System Leak – Evaporative Emission System. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a leak in the Volkswagen CC’s EVAP system, it will throw the P0457 OBDII Code. Volkswagen CC P0457 OBDII Code SymptomsWith Honda vehicles, the P1457 DTC means that there’s a leak detected in the EVAP system. Other manufacturers use the code to signify that the EVAP system can’t maintain proper vacuum in the fuel tank. While these are different definitions, they could ultimately mean the same thing. The EVAP …Feb 26, 2022 · A leak in your BMW's EVAP system will cause the Service Engine Light (SEL) to illuminate in the instrument cluster. It also will cause one (or more) of the following fault codes on a diagnostic scanner including P0455,P0456 and P0442. A BMW EVAP leak will not cause any performance issues with the engine. In some cases, faulty components in the EVAP system can cause vapor leaks. In order to determine if this is the issue, a mechanic will use a smoke test to locate the source of the leak. During this test, smoke is passed through the EVAP system while it's pressurized, helping to identify any leaks.The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Jeep Compass’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a …How to fix a Dodge P0456 Code: Evaporative Emissions System - Small leak detectedVapor Canister Leak Detector on Amazon: https: ...INTRODUCTION In this article you will learn everything from what an EVAP system is and why you need one to common issues and codes associated with the EVAP System. In addition, you will learn how to diagnose and find EVAP leaks and finally what parts you might need to fix an EVAP leak once you find one. Use the table of contents …Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/240/A/evap-emission-control-system-partsEVAP Explained! It's one of the most common OBDII trouble code...Sep 15, 2009 ... S2000 Under The Hood - CEL P1456 evap fuel system leak - Hey guys, I got this CEL P1456 come up a couple of weeks ago and first thing I did ...Nov 25, 2021 ... This kind of intermittent EVAP problem turns out to be the large seal on the fuel pump where it seals to the tank with the big lock ring. It was ...Mar 25, 2020 · Summary. DTC P0455 stands for “Evaporative Emission Control System (EVAP) Large Leak Detected.”. Code P0455 is typically triggered when your vehicle’s computer detects a large leak in the EVAP system. Symptoms of a P0455 include a lit check engine light as well as the smell of fuel in your vehicle. Contentshide. Jun 22, 2022 ... EVAPORATIVE EMISSION SYSTEM SMALL LEAK DETECTED TSI VW AUDI SEAT SKODA If you have evaporative emission small leak detected on tsi engine ...This is how i found the leak in my Evap system. I hope this will help you out as well!! This will also fix the gas cap warning or light.Thanks for watching, ...The EVAP system captures all fuel vapor from the fuel tank and sends them to the engine’s intake to be ignited during the normal combustion process. Its primary function is emissions reduction. Small Leak. A small EVAP leak should not change the way your engine runs nor be considered a breakdown risk. When …EVAP System Basic Operation Fuel vapor flows from fuel tank into canister (light blue area) Vapor flows from canister through purge control valve (red line) Fresh air flows into canister (green line) Connect essential tool J-42909 to the service port and perform EVAP system leak check. There is no need to perform a separate leakDiagnostic trouble code (DTC) P0456 stands for “Evaporative Emission System (EVAP) Small Leak Detected.”. Your car’s computer will trigger this code when it thinks that there’s a minor leak somewhere in the evaporative emissions control (EVAP) system. Common causes of a P0456 code are faulty EVAP hoses, a leaking charcoal …The DMTL is activated as air is pumped through a restrictor orifice 0.3937" = 1.0 mm (0.040 inch leak) or 0.01969" = 0.5 mm (0.020" leak) that causes the pump motor to draw a specific amount of amperage. Next the solenoid valve is energized which seals the system, delivering air pressure to the complete EVAP system.A power-steering fluid leak indicates part of the power-steering system is worn or damaged. The most common cause of a power-steering fluid leak is damaged tubing coming from or go...Mar 24, 2022 · Here are some common EVAP leak fault codes: P0455 – EVAP system gross leak detected. P0456 – EVAP system very small leak detected. P0442 – EVAP system small leak detected. P0440 – EVAP system malfunction. P0441 – EVAP system incorrect purge flow or flow during non-purge. P0457 – EVAP system leak detected (fuel cap) or EVAP canister. Leaks are by far the leading cause of EVAP system trouble codes being set. However, seeing a leak-related trouble code and solving an EVAP system problem can be two …The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Jeep Compass’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a …Sep 30, 2018 · If your Jeep Grand Cherokee has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Jeep Grand Cherokee is the P0442 trouble code. This code appears when connecting the vehicle ... Diagnostic trouble code (DTC) P1456 stands for “Evaporative Emissions Control System Leakage Fuel Tank.”. The code is activated when the powertrain control module (PCM) detects a minor leak in the evaporative emissions control (EVAP) system. The P1456 code can be caused by a missing or faulty fuel filter cap, a malfunctioning …Sep 21, 2023 · The P0455 is just one of the engine codes that needs decoding. The P0455 code is a result of a large leak in an Evaporative Emissions Control System (EVAP). The purpose of that system is to keep the fuel fumes inside the fume lines. If there is a leak in the system, the fumes will end up in the atmosphere causing additional pollution. Common Causes of Evap Leaks. Loose or Faulty Gas Cap: A loose, damaged, or improperly sealed gas cap is among the primary culprits of evap leaks. A …EVAP System Ev-5 Information developed by Toyota. Used with permission. Ev-5. VSV for bypass valve did not close. If a malfunction is detected, the MIL illuminates. MONITOR DTC TABLE. DTC Document Title See Page P0440 EVAP leak (0.040 in.) Ev−12 P0441 VSV for EVAP Ev−14 P0442 EVAP leak (0.020 in.) Ev−12 P0446 CCV or VSV for Bypass Valve ...System Leak – Evaporative Emission System. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a leak in the Jeep Commander’s EVAP system, it will throw the P0457 OBDII Code. Jeep Commander P0457 OBDII Code …A power-steering fluid leak indicates part of the power-steering system is worn or damaged. The most common cause of a power-steering fluid leak is damaged tubing coming from or go...Nissan altima evap leak P0456. Checking the purge valve and vent valve by putting power in to see if the valve opens and closes. Purge valve are close at all...Mar 3, 2022 · During the leak test, the ECM closes the vent control valve and purge valve to seal the evaporative system. If the EVAP system does not maintain the pressure, the ECM recognizes an evaporative emission control leak. In the case of P0456, it is a small leak, less than .020” in diameter. P0456 Causes. There are many potential causes of code ... Oct 7, 2018 · The EVAP system captures all fuel vapor from your car’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Chevy HHR’s computer detects that the EVAP system has a leak, it will throw the P0442 code. P0455 indicates a large leak in the evaporative emission control system. (EVAP). There are different leak size codes. For example, P0456 means your Torrent has a small EVAP leak. While the trouble code may state that there is a “large leak” in the EVAP system of your Pontiac Torrent, the actual leak will most …Certain trouble codes like P0446, P0442, or P0440 indicate a leak or problem with the evap canister or related components. The gas cap is loose or missing – A loose or improperly sealed gas cap allows fuel vapors to escape the system, potentially causing the canister to become overloaded.An "unauthorized third party" engineered the leak, which involved its customer support systems and resulted in "no financial loss." By clicking "TRY IT", I agree to receive newslet...The EVAP system also prevents fumes from escaping the fuel tank. That way, it protects the environment from toxic gasoline or diesel fumes. Obviously, in case of a leak in the system, the environment will be the first to suffer. That alone should be enough to convince you to take action as soon as an EVAP system problem is detected.The P0455, unlike the P0442 code which is a sign of a smaller leak, shows a massive EVAP leak. They can be a sign of leaks in multiple places in the system. Often the only visible sign for this ...Feb 22, 2017 · 23 posts · Joined 2018. #11 · Nov 9, 2018. So I have a P0456 small EVAP leak detected on my Dodge Avenger 2009 RT, which is around 102k miles. I replaced the gas cap yesterday, but that didn't seem to fix it after driving several miles. This morning on way to work, noted faint smell of gasoline, womp womp. P0440: Evaporative Emission Control System Malfunction. Your evaporative emission control system is an essential combination of fuel vapor hoses, a charcoal fuel vapor storage canister and computer-controlled purge and vent valves. These components capture, store and recycle fuel vapors from the fuel tank and fuel delivery system. Evaporative emissions systems leaks are an incredibly common problem on today's vehicles. Finding where the leak is actually occurring can be very difficult....Nov 21, 2023 · OBD II fault code P0455 is a generic code that is defined as “Evaporative Emission System Leak Detected (large leak), and is most commonly set when the PCM (Powertrain Control Module) detects a large leak in the evaporative emissions control system. NOTE: Note that on many applications, this code has a dual definition, in the sense that it ... The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Jeep Grand Cherokee’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Different code numbers represent the leak size.The fuel system within your vehicle is a complicated collection of many parts, including fuel injection lines, fuel tank, filters and pumps. All of these parts must be working toge...Apr 21, 2020 ... #2 · nd4spdbh Well-Known Member ... put some grease around the O ring on your gas cap that seals to the filler neck, clear codes. If they come ...Oct 6, 2018 · When the engine control module (ECM) detects a small leak in the evaporative emissions system, it will trigger the P0456 OBD-II trouble code. This code typically indicates a problem with the fuel tank pressure sensor, the evaporative emissions (EVAP) canister, or a damaged or loose fuel cap. Apr 10, 2021 ... The EVAP Purge Valve has a check valve that splits between the manifold and intake tube. Under vacuum the manifold is used to suck up vapors.Apr 16, 2022 · The EVAP system prevents vapors from escaping the fuel tank and, in the case of BMW cars, relies on the LDP to assess if there’s a leak. The LDP only runs when the engine has been turned on or off and not when it’s running. That’s why you’ll only see an EVAP system leak-related code when you turn the car off and on and not when the ... Nov 24, 2015 · EVAP Leak Detection Pump: 4861962AA (MSRP: $35) EVAP Leak Detection Pump Gasket: 52129436AA (MSRP: $5) Purge Valve: 4891731AA (MSRP $20) Clearing Errors: You can clear your gas cap message but clicking the little odometer reset button in the dash. Of course, if the issue still exists, it'll come right back next time you start the Jeep. In this video, you will learn 4 symptoms of a bad EVAP canister/charcoal canister/vapor canister. Watching this video will help you diagnose whether it is ti...When the LeakDetection Pump (LDP) detects thisgross leakduring an EVAP test, the ECM generates a P0455 code. Multiple factors could trigger an EVAP leak, causing the ECM to generate the DTC P0455 trouble code. You’ll also see the Check Engine Light (CEL) illuminated on your dashboard. Note: If it’s a small leak, the ECM will pull up …If you aren’t familiar with it, the evaporative emissions system leak reflects the leak of harmful exhaust fumes into the atmosphere. The EVAP system usually takes …The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Ford Flex’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Different code numbers …If the target pressure is not achieved, the PCM concludes that there’s a large leak in the gas vapor system and, after several confirmations, will set a P0455 (gross leak). If the negative pressure exceeds the target pressure, the PCM will set a P1450 for excessive negative pressure, which would likely indicate blocked vapor lines or possibly a stuck-open CPS.The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Ford Expedition’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Different code numbers represent the leak size.Nothing’s worse than a broken pipe. This article will help you find the best sealant for your leaking pipe by reviewing the best options on the market. Expert Advice On Improving Y...System Leak – Evaporative Emission System. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a leak in the Jeep Cherokee’s EVAP system, it will throw the P0457 OBDII Code. Jeep Cherokee P0457 OBDII Code SymptomsAug 21, 2021 ... A few weeks ago I got a MIL and a P0456 code (small leak detected in EVAP system). I was at the very end of my 3rd party warranty from ...Step 10: Install the new EVAP emissions control canister. The installation of this component is an exact reversal to the removal. Prior to installing the new canister, inspect the condition of the vent hoses. If they are worn, cracked or are showing signs of age, replace them. Step 11: Attach bolts and clips.The EVAP system prevents vapors from escaping the fuel tank and, in the case of BMW cars, relies on the LDP to assess if there’s a leak. The LDP only runs when the engine has been turned on or off and not when it’s running. That’s why you’ll only see an EVAP system leak-related code when you turn the car off and on and not when the ...Leaks are by far the leading cause of EVAP system trouble codes being set. However, seeing a leak-related trouble code and solving an EVAP system problem can be two …Evaporative Emission (EVAP) Leak Detection Control Module. The EVAP leak detection control module consists of a vacuum pump, a pressure sensor, a 0.02" reference orifice and a switching valve. The vacuum pump is used to apply a vacuum across the reference orifice and to apply a vacuum on the EVAP system for the EVAP leak check monitor.System Leak – Evaporative Emission System. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a leak in the Jeep Commander’s EVAP system, it will throw the P0457 OBDII Code. Jeep Commander P0457 OBDII Code …Don't pay more than you have to in order to heat your home. With temperatures around the country plummeting over the past few days, any air leaks in your home have likely become pa...May 15, 2023 · P0440 – EVAP System Malfunction: This code indicates a general malfunction in the EVAP system. It could be caused by various factors, including a faulty sensor, malfunctioning valve, or leak. P0456 – EVAP System Very Small Leak Detected: This code indicates that a very small leak has been detected in the EVAP system. System Leak – Evaporative Emission System. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a leak in the Volkswagen CC’s EVAP system, it will throw the P0457 OBDII Code. Volkswagen CC P0457 OBDII Code SymptomsIn the majority of cases, diagnostic trouble code P0457 is caused by a loose gas cap. This condition causes a loss in vacuum within a vehicle’s evaporative emissions system. As such, a system leak is quickly registered and is ultimately logged as DTC P0457. A cracked or otherwise damaged gas cap can also cause similar issues, and …INTRODUCTION. In this article you will learn everything from what an EVAP system is and why you need one to common issues and codes associated with the …

Oct 7, 2018 · The EVAP system captures all fuel vapor from your car’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Chevy HHR’s computer detects that the EVAP system has a leak, it will throw the P0442 code. . Custom license plate ny

evap system leak

P0440: Evaporative Emission Control System Malfunction. Your evaporative emission control system is an essential combination of fuel vapor hoses, a charcoal fuel vapor storage canister and computer-controlled purge and vent valves. These components capture, store and recycle fuel vapors from the fuel tank and fuel delivery system. Oct 15, 2022 · Repairs of an EVAP systems leak should typically cost between $200 and $400, but you must double-check that it’s the same in your area. Below is a list of the price breakdowns for various automobiles. These costs will change based on location and the precise fixing your EVAP system requires. Mar 31, 2023 ... Evap codes p0441 and p0445. I made a video on how to go about checking evap system including smoke testing the lines. It turns out it was the ...I have a 2016 Ford Fusion with a Check Engine Light on. OBD 2 Scan shows a CODE P0456. Evaporative Emission System Leak Detected (Very Small Leak). In this v...Sep 18, 2023 · An evaporative emission control system (or EVAP for short) typically includes the fuel tank, gas cap, purge valve, vent valve, and EVAP (charcoal) canister. These components work together to prevent fuel vapors from escaping into the atmosphere, and to comply with emissions regulations, the system must be leak-free. The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Jeep Compass’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a …When experiencing an EVAP leak of any kind, the first thing to do is to check the EVAP and the fuel systems. Typical Causes Behind a P0455 Code Alert. The only cause that can trigger a P0455 code is a complex EVAP leak. These EVAP vapor leaks can be caused by leaks in several parts of the system or by one big leak. Damaged or faulty …The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk. System Gross Leak. When there is a large leak in the Honda Fit’s EVAP system, it will throw the P0455 OBDII Code. P0455 indicates a large leak in the …P0456 – EVAP System Very Small Leak Detected. P0457 – EVAP System Leak Detected (Fuel Cap) or EVAP Canister. How much can it cost to fix an EVAP issue? The cost of fixing an EVAP issue depends on the severity of the problem. If it is a component failure, it may be quick to fix and may have a low cost.Apr 29, 2022 · If the purge valve leaks, it could trigger a P0455 or P0442 code, but it might also trigger a different EVAP code. If the purge solenoid is defective, replace it. Steps include removing the hoses and disconnecting the electrical connector. 3. Faulty Vent Solenoid Valve – P0442 or P0455. Vapor canister and fuel tank. An explanation of what an Evap Leak is and what is the Evap system does along how to fix it. Possible Evap Leak Causes:Gas CapCharcoal CanisterVent Valve Pu...Causes of the P0441 Code. Many parts of the EVAP system can fail, leading to the P0441 code. Here are a few of the most common causes: Bad canister purge solenoid. Not tightened/bad gas cap. EVAP leak / cracked EVAP hoses. Voltage feed circuit short. Canister corrosion. Clogged or a restriction in the EVAP lines.The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Ford Flex’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Different code numbers …Apr 30, 2018 ... Do you hear air? If yes, then your valve seals are probably toast. Next look into the antifreeze overflow bottle. Do you see bubbles forming? If ...Apr 19, 2018 · It may be possible to use an air mattress inflator or shop-vac outlet, which won’t inflate over 2 or 3 PSI. Simply pressurize the system and spray down EVAP system components with a soapy solution. A 50/50 solution of car wash and windshield washer fluid works well. Leaks will show up as bubbles or foam. If the target pressure is not achieved, the PCM concludes that there’s a large leak in the gas vapor system and, after several confirmations, will set a P0455 (gross leak). If the negative pressure exceeds the target pressure, the PCM will set a P1450 for excessive negative pressure, which would likely indicate blocked vapor lines or possibly a stuck-open CPS.May 5, 2021 · Diagnostic trouble code (DTC) P0456 stands for “Evaporative Emission System (EVAP) Small Leak Detected.”. Your car’s computer will trigger this code when it thinks that there’s a minor leak somewhere in the evaporative emissions control (EVAP) system. Common causes of a P0456 code are faulty EVAP hoses, a leaking charcoal canister, or a ... Apr 30, 2018 ... Do you hear air? If yes, then your valve seals are probably toast. Next look into the antifreeze overflow bottle. Do you see bubbles forming? If ...Sep 17, 2018 · The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. Leak Detected (Small) When the Ford Expedition’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Jun 5, 2013 ... Look at the underside of the gas cap and see the rubber seal? Its usually all gummed up and dirty clean it off. Then look at your filler neck, ....

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