Code p0442 refers to evaporative emission system(EVAP)--small leak detected==causes-- hose connections,--intake leak--EVAP canister--EVAP canister purge valve
it also refers to large leak detected ( loose fuel cap/missing cap) causes--mechanical fault--hose connections---EVAP pressure sensor
If it has just started then check that the fuel cap is on tight or replace the pressure sensor or lastly ( it will probably the most expensive) the purge valve.
SOURCE: 2001 Sable gets P0401 first, then gets P0442 some
This could be a small evaporative system leak. Check the gas cap to be installed fully. If fully installed may need replaced.
Need pic o diagram
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