Help with intake leake 2005 VW JETTA.

Question

I have a 2005 automatic 2.5LVW Jetta that is throwing many codes; ( P0455 system large leak, p0171 system too lean bank 1, P2279 intake air system leak, p0527 (faulty code?) the car while in park idles real high, and revs by itself between 1500-2000rpm. I know it's there some leak in the intake system just need an advise on where should I start to look

Answer 1

P0455 Evaporative emission system leak detected, gross leak / no flow

P0171 Fuel trim lean Bank 1

P2279 Oxygen sensor stuck lean

P0527 Idle air control system higher than expected

P0455 can also represent there is no purge flow for the EVAP system and this may just be where the leak is located. The rest of the code condition that the engine has may just be the  result of this vacuum leak.

 Here the location of the purge valve

 What you want to check for is the vacuum hose is connected , not torn , or disconnected