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Old 08-25-2011, 03:59 PM   #1
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Evap System- Where to start

About a week or so ago, my check engine light came on. Pulled the codes, and i got PO442 and PO445 (not sure about this second code, but there were 2 codes and both were for the evap system)

PO442 was a small leak in the evap system, and PO445 (?) was a large leak in the evap system according to the short descroption my code reader gives. That day all i did was take off the gas cap, and put it back on to be sure its tight. I took the negative off the battery to reset the codes, and waited to see if the check engine light would come back on

Its been about a week, give or take, and my check engine light came back on, but only for the code PO442- small leak in the evap system. Is it normal for it to take a week for the code to come back?

Where should i start? Im assuming just by buying a new gas cap? And if that doesnt do it, then what should i look at next?

Also, is reseting the codes after i troubleshoot the correct thing to do? or will the light go off when i fix the problem?

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Old 08-25-2011, 07:13 PM   #2
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I've had this code before and after about a week the ce light went out on its own. About a year later it came back. I cleared it with my code reader and haven't seen it again.

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Old 08-25-2011, 07:28 PM   #3
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good news buddy, im not at all concerned, because from what i read the EVAP system has to do with holding gas fumes from escaping the vehicle...so in no way affects my ability to drive the jeep...i just want that light to go off haha
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Old 08-25-2011, 07:53 PM   #4
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I have never seen this code on my Jeep, but I have read on the forum that that can be caused by a gas cap not sealing properly.
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Old 08-25-2011, 08:42 PM   #5
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Yupp. tried that. gunna get a new gas cap just in case mine doesnt make a good seal anymore. Any ideas what to try next if that doesnt fix it?
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Old 08-25-2011, 09:09 PM   #6
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I'd check the lines to the evap canister as well. On your driver side inner fender. Look for any small cracks on along the hoses there and replace any.



Cracked hose reference


More info might help in this thread where the pics came from Diagnosing Codes
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Old 08-25-2011, 09:27 PM   #7
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Thanks for the info, pics, and link buddy. I appreciate it.
Im not sure if the codes correspond to a certian part of the evap system, or just indicate a leak somewhere in the system. A few google searches gave me no real answer, so i came here, WF is great, i always get savy responses
I try to not post questions that have been answered already, but i must have missed that thread
Thanks again =)
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Old 08-26-2011, 01:04 PM   #8
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Its really only a problem if you need to get smogged. Finding a small leak is tricky. Its normal to take a couple days worth of driving, and or a few cold starts for the code to come back.
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Old 08-26-2011, 01:20 PM   #9
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Quote:
Originally Posted by jgorm View Post
Its really only a problem if you need to get smogged. Finding a small leak is tricky. Its normal to take a couple days worth of driving, and or a few cold starts for the code to come back.
x2 if you don't have emissions testing don't worry about it unless you smell gas...

I've spent the better part of the last year chasing down a small evap leak... I got it plugged just long enough to get through emissions so I'm not worrying about it till 2 years from now when I need to do it again...
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Old 08-26-2011, 07:44 PM   #10
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If the cap doesn't take care of it, and a visual inspection doesn't spot anything, a good shop can run a smoke test on the evap system. Unit pumps smoke through the sealed system. Follow any smoke to the defective/leaking component(s).
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Old 08-26-2011, 11:25 PM   #11
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Thanks for the info guys. Much appreciated. I get the jeep inspected by a private garage, cause my tires stick out way past the fender flares. If the guy lets me pass with that, id think he'd prob pass me even though i have a small leak right...i gotta get it inspected in like 2 or 3 months
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Old 08-27-2011, 01:31 AM   #12
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Mine threw the 445 large evap leak code a couple weeks ago. I did the gas cap thing and reset. No help. Then, I was planning on dropping the gas tank to check all the hoses. I recently installed a Savvy gas tank skid and thought I did not get a line all the way connected. I drove the Jeep around every chance I could, to get rid of the gas in the tank. It ran fine. I crawled under it to get ready to drop the tank, and there it was. A white plastic evap line connector was broken, and the lines were not connected. It was located inbetween the rear drivers spring and the gas tank. I didn't even have to drop the tank. I just cut the plastic connector off and replaced it with a small piece of hose. Problem solved for me. I hope your problem is the same and as easy to fix.
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Old 08-27-2011, 01:29 PM   #13
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hopefully dude. thanks for the reply

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