05-11-2011, 01:42 PM
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#1
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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These are the likely candidates:
P0440 Fuel Tank Ventilation System - Above Limit
P0441 Fuel Tank Ventilation System - Above Limit
P0442 Fuel Tank Ventilation System (Micro-leak) - Below Lower Limit
P0444 EVAP Canister Purge Valve - Open Circuit
P0445 EVAP Canister Purge Valve - Short to B+/Short to Ground
P0446 EVAP Canister Shutoff Valve (Function) - Below Lower Limit
P0447 EVAP Canister Shutoff Valve (Output Stage) - Open Circuit
P0448 EVAP Canister Shutoff Valve (Output Stage) - Short to B+/Short to Ground
P0450 Tank Pressure Sensor - Signal Implausible
P0452 Tank Pressure Sensor - Short to Ground
P0453 Tank Pressure Sensor - Short to B+
P0455 Fuel Tank Ventilation System (Major Leak) - Below Lower Limit
Really need to know exactly which code you're getting. Might be worth investing in an affordable code reader.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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06-25-2012, 08:02 AM
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#2
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Registered User
Join Date: Aug 2010
Location: Harrison, TN
Posts: 52
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Well, this has been a long time. After that trip I ended up replacing the gas cap with an autozone model. That seemed to do the trick, for a while.
It seems that the cel comes back every once and a while.
The code is P0455.
Should I try a OEM cap? I never hear the rush of air when I take the cap off.
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06-25-2012, 09:28 AM
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#3
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,647
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Quote:
Originally Posted by greenerob
Well, this has been a long time. After that trip I ended up replacing the gas cap with an autozone model. That seemed to do the trick, for a while.
It seems that the cel comes back every once and a while.
The code is P0455.
Should I try a OEM cap? I never hear the rush of air when I take the cap off.
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Get an OEM cap, they are the only ones that do not seem to cause the car to throw codes........
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-27-2018, 11:52 AM
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#4
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Registered User
Join Date: Feb 2017
Location: Virginia
Posts: 22
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Quote:
Originally Posted by thstone
These are the likely candidates:
P0440 Fuel Tank Ventilation System - Above Limit
P0441 Fuel Tank Ventilation System - Above Limit
P0442 Fuel Tank Ventilation System (Micro-leak) - Below Lower Limit
P0444 EVAP Canister Purge Valve - Open Circuit
P0445 EVAP Canister Purge Valve - Short to B+/Short to Ground
P0446 EVAP Canister Shutoff Valve (Function) - Below Lower Limit
P0447 EVAP Canister Shutoff Valve (Output Stage) - Open Circuit
P0448 EVAP Canister Shutoff Valve (Output Stage) - Short to B+/Short to Ground
P0450 Tank Pressure Sensor - Signal Implausible
P0452 Tank Pressure Sensor - Short to Ground
P0453 Tank Pressure Sensor - Short to B+
P0455 Fuel Tank Ventilation System (Major Leak) - Below Lower Limit
Really need to know exactly which code you're getting. Might be worth investing in an affordable code reader.
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Hi , so i keep getting the p0455 code and i replaced the gas cap with the orginial one and still coming back. Any help??
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03-27-2018, 12:54 PM
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#5
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,647
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Quote:
Originally Posted by Sweezy804
Hi , so i keep getting the p0455 code and i replaced the gas cap with the orginial one and still coming back. Any help??
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You are going to need to start checking both the fuel system and the EVAP system for leaks. As it is a large leak, you may be able to hear it.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-28-2018, 06:31 AM
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#6
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Registered User
Join Date: Feb 2017
Location: Virginia
Posts: 22
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Quote:
Originally Posted by JFP in PA
You are going to need to start checking both the fuel system and the EVAP system for leaks. As it is a large leak, you may be able to hear it.
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I can only hear it at random times when im driving , i was thinking fuel vent valve because its hard to fill her up now when she gets above half tank it goes slow , so what happens if i ignore this problem? Just low gas milage?
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03-28-2018, 07:46 AM
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#7
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,647
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Quote:
Originally Posted by Sweezy804
I can only hear it at random times when im driving , i was thinking fuel vent valve because its hard to fill her up now when she gets above half tank it goes slow , so what happens if i ignore this problem? Just low gas milage?
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Well, for one, the car won't pass emissions inspection.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-28-2018, 09:18 AM
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#8
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Registered User
Join Date: Sep 2012
Location: S. New Jersey
Posts: 1,239
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Just went through the evap. issue. Mine would get a vary rare 0442. I thought gas cap and I keep clearing. Then at inspection it showed that the evap monitor was not completing and therefore 30 days to fix. I broke for the first time and went to an indie for help. Mine was a canister and purge valves. This is a hard one to diagnose and hard to get at and that's why I figured it would be less stressful to have a pro do it
__________________
2002 S - old school third pedal
Seal Grey
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03-28-2018, 01:26 PM
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#9
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Registered User
Join Date: Feb 2017
Location: Virginia
Posts: 22
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Quote:
Originally Posted by JFP in PA
Well, for one, the car won't pass emissions inspection.
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How do i find this leak ?
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Name my car - no
Hybrid Mode
