Where do I look for PO 442 EVAP Emissions Control System Leak small on 2000 Lincoln Town Car

I don't know where to look for a small leak PO442?

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2 answers 1 comment
ck the gas cap o ring for cracks or flatened seal. repl if orignal its a very cheap guess
Agree with greg but use oe part!
Have the system smoked by a mechanic not expensive!