I have a 99 honda civic ex coupe with a b18c 96 spec itr i ran the codes on a usdm ecu and it through me p0113 which is the iat sensor but i bought a little piece of **** intake from advanced and idk if theres a dpot to put it and it also through me code p1259 pls help

 

code p1259,,,
- Low engine oil pressure or level
- Open or short circuit condition
- Faulty VTEC oil pressure switch
- Faulty VTEC solenoid

and if your iat sensor is not hooked up,then ya, its letting you know "hey where is the iat? ecu,s are pretty smart. it cant run right without it.