Try removing the batt cable for a few minutes and re enstall.Ck engine light should be off now.
Lots of times this code is just bad or loose fuel cap allowing vacuum to leak past at test by computer try cleaning rubber gasket or replace it best place to start. All my jeeps have had exact issues
The OBDll system will need to be reset with a scanner. Waiting for the computer to do a system can take time and mileage.
SOURCE: 2003 Jeep Grand Cherokee Laredo - Code P0456 EVAP leak
open hood and ck for broken vacuum hoses going to the purge valve(2 vacuum ports and a wiring connector)
on the drivers side between airbox and firewall
if good remove driver side rear tire and inspect hoses next to the gas tank and 3rd, the canister is in that wheel well also insp for cracked hoses there also, been working for jeep 12 years i charged people about 1 hour to correct this probem.
Testimonial: "Thanks!"
SOURCE: 2000 daewoo leganza the pvc elbow
I use a web site www.car-parts.com to find used parts all over the country. The site sorts by price and location so you can order what you need from anywhere you want.
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