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Old 09-08-2013, 08:26 PM   #1
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Jk Trouble codes

Hi guys, having some problems with my 2007 sahara jk. Completely stock and just rolled 100k! I have some check codes coming up and im wondering if anybody can help. My Jeep is running a little rough while idling and the check engine light is flashing when it stats to run rough. These are the codes that i am getting P0456, P0440, P0300, and P0152. I believe that P0152 is an o2 sensor, and that P0300 is a random misfire. The other codes are related to an evap problem. Just wondering if anybody knows what could be causing the 152 and the 300. Im thinking that it may be plugs/ wires, I dont know that they have been replaced. The other things that im thinking it could be is, o2 sensor or a bad cat. Please help!!!

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Old 09-10-2013, 07:34 PM   #2
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Just replaced coil pack, wires and plugs and it seems to have gotten worse. I now also hear a occasional clunk that sounds like it is coming from the exhaust. Please help!

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Old 09-10-2013, 07:53 PM   #3
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Location: Olympia, WA
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P0152 - O2 Sensor 2/1 Circuit High
P0300 - Multiple Cylinder Misfire
P0440 - General Evap System Failure
P0441 - Evap Purge System Performance
P0443 - Evap Purge Solenoid Circuit
P0452 - Evap Pressure Switch Stuck Closed
P0455 - Evap Purge System Large Leak
P0456 - Evap Purge System Small Leak


Bob K.
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Old 09-10-2013, 08:19 PM   #4
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thanks bob, I just replaced the battery and the engine is still running rough and the clanking noise is still there. I cleared and re ran the codes and all that im getting now is the p0300. Any ideas?
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Old 09-10-2013, 08:55 PM   #5
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I would hazard a guess that either the wires are shot, or the coil pack is bad. Pull the plugs and see which is fouled. Walk the wires, run it, and then check the plugs again. If the same plugs foul, it's the coil pack. If different ones foul, you need new wires.

Bob K.
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Old 09-10-2013, 09:18 PM   #6
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already replaced wires, plugs, and coil pack

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