System Leak (Small). This means that the EVAP Control system has detected a
leak, most likely, but not always, the gas cap. The charcoal canister is
also known to trigger a code, but usually a P0440 EVAP Emission Control
System Malfunction code. I know this because my charcoal canister was the
culprit when I recieved this code. Another possiblilty is that one of your
vaccuum lines related to the emission system, has become disconnected. Have
you been working under the hood lately?
Hope this helps.
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