P0456 2006 Dodge Caravan -

Question

mechanic said he already replaced o2 sensor , ECR valve & return line on tank.  Says may need another o2 sensor or replace gas cap.  Any advise?  Don't want to spend another $400

Answer 1

P0456 Evap leak detected (Small leak)

The fuel cap should be the first to be replaced, It also very important that the fuel cap be properly tighten some fuel cap required certain amount of clicking noise to ensure that the fuel cap is properly secured.