MY CHECK ENGINE LIGHT CAME ON CODE P0442 BUT i DONT HAVE GAS CAP

NO,that code p0442 don't mean or tell you to replace the fuel cap. the code means>>OBD-II Code P0442 is defined as a Evaporative System Malfunction, Small Leak! Common Problems That Trigger the P0442 Code>>Defective or damaged fuel cap Distorted or damaged Fuel Tank Filler Neck Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister Defective Fuel Tank Sending Unit gasket or seal Small split in a seam of the Carbon Canister Defective Evaporative Vent Valve and/or Evaporative Purge Valve Defective or damaged Fuel Tank Defective Fuel Tank Pressure Sensor Defective Leak Detection Pump Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system..> if you can't find the small leak(possible hose leak) or any of the above,then a smoke test will be needed....