Have a p0440 code reading for a 09 Sonata, what could I do to fix this.

Question

Reading a p0440 code for a hyundai sonata, How to fix this. and possible cost

Answer 1

start by checking your gas cap it might be loose

 

Possible causes

- Missing or loose fuel cap

- Incorrect fuel filler cap used

- Fuel filler cap remains open or fails to close

- Foreign matter caught in fuel filler cap

- EVAP canister or fuel tank leaks

- EVAP system hose leaking

- Fuel tank leaking