P CODES (POWERTRAIN) P1100 - P1199 P1136 Questions

Several Days Ago My 97 4runner Showed A Trouble Code P0136, Scheduled Appointment To Replace But Mechanic When Double Checking Today Found...

2001 Tt Turbo Quattro With Check Engine Light Giving Code P1136. What Is The Most Likely Cause For This Code?

I Keep Getting P1136 Code That Won't Go Out And I Changed Bank 1 And 2 Intake Valve Timing Back 2 And P0452 Pressure E Evap Code.