my 1998 jeep grand cherokee laredo has code po455.

Question

my jeep previously sat for at least two years.

Answer 1

Hi there

This code is for a large evap emissions leak. There can be several causes for this starting with the gas cap and going through the whole evap system. I would check the gas cap, then the vent control valve and finally if they all look good, have a smoke test performed to find the leak.

P0455 JEEP - EVAP System Large Leak

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