car runs totally perfecthas 97000.how do i find this smal leak? and get ur done. need a smog check.only so many parts ,charcoal canister,purge valve,leak detect conrol,
evap. emissions sys.detectes a small leak code:p0442 on 1997 BMW 328iC
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Best way is to go to a shop and have them do a 'smoke test' this will quickly locate the source of the leak.
OR POSSIBLY A SOLENOID HANGING OPEN, BUT YES START WITH A SMOKE TEST. ALSO CK GAS CAP FOR A CRACKED O-RING