What it shows is that the vehicle is not at readyness,what that means is that all of the self diagnostics tests have not been performed yet. It can take a couple of miles or key cycles to 100 miles depending on the vehicle. On an EVAP problem if you see a small leak which can be set by simply leaving the key on while the fuel cap is removed to lines leaking pressure a new gas cap is an easy approach to attempt a solution.
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