169,OOO and recently started throwing up codes po 171 and 174. Checked for vacuum leaks old school, didn't see anything, car runs smooth, ck eng light back on , cleaned maf two times and yes I have K&N but I swear to God I will never oil it again because I don't live on a dirt road and I'm not rally racing.
Just sharing that the PCV boot is susceptible to be a culprit. Mine would not show me until I pushed on it. opened up like a birth mother. just wanted to share if it could help any yall.