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the code ur are getting on your envoy is a emiision problem first you could try a new gas cap its a known problem in setting this code ...hope this helps
po440 is emission control system malfunction, Probable Causes: a) Defective or loose fuel cap b) EVAP Canister or hose cracked- not connected c) Purge or vent solenoid defective d) Vacuum leak at engine.
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