P0171 KIA -

Question

1previously had p0401 and p0172. i found a VACUMN LEAK, CORRECTED IT, ERASED THE CODE AND THE P0171 CAME ON. I ERASED IT AND IT HASN'T COME BACK ON FOR A FEW MILES. ANY COMMENTS?

Answer 1

This code is normally caused be a cracked vacuum line to the pcv valve.

Take some carb cleaner and with the engine running, spray it along the intake and any vacuum lines you can find. If the idle speed increases, then there is a vacuum leak.