What does driver 3 line 5 mean

a code doesn't tell you to replace a part,and what part did you replace? who read the code and what was the code(PXXXX,or P0XXX)?

Hello, A common misconception about trouble codes is that they indicate what should be replaced. Actually, the codes that are stored in the engine control module indicate how a fault was noticed. There are some codes, like your P1665 that indicate where to test, but, that isn't typical. P1665 tells you that the circuit for driver 3, line 5 must be tested, as there may be a fault in the electronic circuit. The short answer is to test the evap canister vent solenoid, and if it passes, test the circuit for that solenoid. You may find physical damage or just a bad solenoid.