Diagnosatic code help
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Captain
Joined: Jun 2009
Posts: 514
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From: laurel, de
Diagnosatic code help
Just had my codes read at autozone the they where
p0456
p0420
p0442
I know the one was just a sensor but the other two where something to do with a evap leak or vacuum line they said. Any ideas what it could be.
p0456
p0420
p0442
I know the one was just a sensor but the other two where something to do with a evap leak or vacuum line they said. Any ideas what it could be.
Legend
Joined: Feb 2005
Posts: 8,058
Likes: 184
From: Fort Worth, TX
vacuum lines to the charcoal can. common failure...i have to do same for my Dako. Somehow, our ram is at 175K miles and hasnt had that error yet.
Veteran
Joined: Apr 2009
Posts: 337
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1P0420 (M)
Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst 1/1 efficiency below required level.
2
P0442 (M)
Evaporative Emission Control System Leak Detected (medium leak)
3
P0456 (M)
Evaporative Emission Control System Leak Detected (very small leak)
#1 cat effecency code tough to diagnoise with out reading O2 sensor outputs...Let us know any other codes- MODIFICATIONS - recient work -repairs- accident-
#2 and 3 are evap system codes....Always start simple check gas cap, be sure it seals... look under truck @ gas tank* area inspect EVAP vac hoses looking for something cracked unpluged.. the evap lines stsrt at engine often have a yellow? cap at the test port again looking for caracked unpluged lines.... Next willbe to troubleshoot the valves will ry to get pictures but start with the easy AND answer the questions
PS: i do not understand comment "just a sensor"
*will post exact location....under bed at tank sometimes eng bay tucked away in front
Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst 1/1 efficiency below required level.
2
P0442 (M)
Evaporative Emission Control System Leak Detected (medium leak)
3
P0456 (M)
Evaporative Emission Control System Leak Detected (very small leak)
#1 cat effecency code tough to diagnoise with out reading O2 sensor outputs...Let us know any other codes- MODIFICATIONS - recient work -repairs- accident-
#2 and 3 are evap system codes....Always start simple check gas cap, be sure it seals... look under truck @ gas tank* area inspect EVAP vac hoses looking for something cracked unpluged.. the evap lines stsrt at engine often have a yellow? cap at the test port again looking for caracked unpluged lines.... Next willbe to troubleshoot the valves will ry to get pictures but start with the easy AND answer the questions
PS: i do not understand comment "just a sensor"
*will post exact location....under bed at tank sometimes eng bay tucked away in front
Last edited by kev2; Jul 5, 2009 at 04:46 PM.
Thread Starter
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Captain
Joined: Jun 2009
Posts: 514
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From: laurel, de
#1 cat effecency code tough to diagnoise with out reading O2 sensor outputs...Let us know any other codes- MODIFICATIONS - recient work -repairs- accident-
Just had new exhaust put on about 2 weeks ago. About 3 months ago upper raidiator hose busted and sprayed antifreeze everywhere. Ended up gettin into 2 coilpacks and shorting it out and cause me to run with 2 down cylinders. But got that fix immedeatly
PS: i do not understand comment "just a sensor"
that is what autozone told me that the one code was just a emissons sensor
Just had new exhaust put on about 2 weeks ago. About 3 months ago upper raidiator hose busted and sprayed antifreeze everywhere. Ended up gettin into 2 coilpacks and shorting it out and cause me to run with 2 down cylinders. But got that fix immedeatly
PS: i do not understand comment "just a sensor"
that is what autozone told me that the one code was just a emissons sensor
Veteran
Joined: Apr 2009
Posts: 337
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tell us about the exhaust ...may hold some clues to p0420
....hopefully nnothing changed from OEM spec ...
new cat, remove cat, oversize pipes, hi flow muffler, can be problematic... but a place to start troubleshooting
With computer controlled engines the idea that it is JUST a sensor OR only an emission "thing" not good advise...
....hopefully nnothing changed from OEM spec ...
new cat, remove cat, oversize pipes, hi flow muffler, can be problematic... but a place to start troubleshooting
With computer controlled engines the idea that it is JUST a sensor OR only an emission "thing" not good advise...
Administrator
Joined: Jul 2007
Posts: 24,686
Likes: 21
From: South Georgia/East Florida
Goto the FAQ section, I have a diagram of the entire Evap system there. It will aide you in tracking down your leak.
