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Old 06-23-2014, 10:10 PM   #1
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Check engine, many codes

I got this 4 codes p0300, p0440, p0456, p0457. I know what this mean but somebody can help me to know where i begin??? And im concerned about the p0300 thanks! Just to get you know here in my country theres no jeep dealer all jeeps are imported from usa. Thank u!

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Old 06-23-2014, 10:34 PM   #2
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P0300 is cylinder misfire P0440 is evaporation emission system P0456 is a leak In the evap emission system or a gas cap issue P0457 is a gas cap malfunction
I would replace the gas cap and see what codes are removed

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Old 06-23-2014, 10:47 PM   #3
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thank u i all ready replace the gas cap and reset and still the same codes
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Old 06-23-2014, 11:25 PM   #4
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I would check the evap system and make sure no hoses are cracked or damaged and that the connections are tight as well as the purge valve.
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Old 06-23-2014, 11:37 PM   #5
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And make sure you check your charcoal canister for cracks or damage
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Old 06-25-2014, 12:12 AM   #6
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thank u very much i will try this!!!
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Old 06-26-2014, 02:54 PM   #7
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No problem!
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Old 06-26-2014, 04:02 PM   #8
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I would try to address the p0300 before the other issues

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Old 06-26-2014, 05:00 PM   #9
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P0300 doesn't specify which cylinder just random. It could be caused by the evap system

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