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MODEL:Cavalier ls sport
DESCRIBE ISSUE.... just got the car in trade and is giving a p0440 - EVAP system malfunction all i have access to is code reader so don't have more than this but am told this could be due to the cas cap being defective is that the major cause of this or could it be something else?
p0440 is a generic EVAP system code, often other codes or issues are present.
Do not clear/erase the code - suggest you take advantage of free scans at many auto parts stores.
Will your code reader read ALL codes esp manufacturers specific - ie P111x?