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what is po442/po455 on jeep grand cherokee 2004

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what is po442/po455 on jeep grand cherokee 2004?

Vehicle: jeep grand cherokee 2004

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The P0442 and P0455 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose gas cap is the most common cause that triggers the codes. 
 

Check the cap, if the seal if dry or cracked replace it with a OEM Jeep gas cap.

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