Check Engine Light- Code PO442 -
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post #1 of 4 Old 01-11-2011, 05:32 PM Thread Starter
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Check Engine Light- Code PO442

2003 Liberty 3.7L.....check engine light went on this morning, and stayed on while vehicle was running. Jeep runs fine. I manually retrieved the code PO442. After I got the code, I disconnected the battery, and the check engine light went out. I drove it around some, and as of yet, it has not come back on. Would appreciate comments, suggestions, and if possible, the meaning of PO442. Thanks in advance.

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post #2 of 4 Old 01-12-2011, 12:46 PM Thread Starter
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problem solved at least for now

I took the gas cap off, and made sure to seat it real firmly. Then i disconnected the negative cable of the battery for about a minute, reconnected it, started the engine, and the check engine light went out. After driving for about 30 miles, it's still out, so I'm hoping I solved my own problem.
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post #3 of 4 Old 01-13-2011, 09:23 AM
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2006 KJ Liberty 
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More info here.
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post #4 of 4 Old 01-13-2011, 10:42 AM Thread Starter
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light back on

Originally Posted by jp7794 View Post
More info here.
the check engine light came back on this morning, so i figure I either have to replace the gas cap, or there's a leak somewhere. I wouldn't even know where to begin to look for any leak.
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