SOME 2014-2015 EXPLORER AND TAURUS VEHICLES EQUIPPED WITH A 3.5L OR 3.7L TI-VCT ENGINE MAY EXHIBIT AN ILLUMINATED MIL WITH DIAGNOSTIC TROUBLE CODE (DTC) P0138 AND/OR P0158 STORED IN POWERTRAIN CONTROL MODULE (PCM) MEMORY. FOLLOW THE SERVICE PROCEDURE STEPS TO CORRECT THE CONDITION.