Aright guys i just got a 98 hatch and i tried to pass my state somke inspections and i failed for this :
P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
P0420 Catalyst System Efficiency Below Threshold
P0505 Idle Control System Malfunction
P0509<<<< I dont know what this code is

how can i fix this codes , so i can pass my emissions?
And can i just go back and reflash my ECU to pass them?
TIA Dan