oh that one...
ok now that I understand and remember what that is.
1) check gas cap make sure it's ok
2) check the hoses in front of the intake manifold passenger side right in front of the the cable for the throttle. between the PS and alt. Those hoses can cause this problem. If any of these have a leak this cel will happen. I zip tied mine on for good measure.
3) look under the passenger side rear bumper at the gas evaporator box thing near the wheel. There is a two wire connector there. make sure both wires are connected to the connector. If it's not solder the connections and seal it with shrink tubing.