i have a 1999 hyundai elantra spitting out 1-PB00. P. 2-P1700. Cant find these in scanner code book

 

P1800 involves the VIAS , Variable Air Intake System
There is a solenoid located on the intake plenum (Manifold) that controls vacuum to a diaphram that controls the length of the intake ports. Check out that solenoid for functioning. Located on front where you can easily see it.