Powertrain, generic (extended)

P2ADF Intake Air System Leak Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2ADF means the engine control module has concluded that air reaches the cylinders of bank 2 without passing the air measurement. Audi documents the code for the 4.0 litre TFSI V8 in the A8, S8, SQ7, SQ8, RS Q8, RS 6 Avant and RS 7 from model years 2019 to 2023. Drivers notice the check engine or exhaust warning lamp and a whistle from the engine bay; misfire codes for bank 1 and P2279 for bank 1 can be stored alongside. Audi's remedy is a new full-load crankcase breather line serving bank 2, while the oil separators and part-load lines stay in place. On other engines, split intake or boost hoses, leaking manifold gaskets and a stuck crankcase ventilation valve are the usual leak points. P2279 covers the same check for bank 1.

Likely causes

Leaking full-load crankcase breather line on bank 2 (Audi 4.0 TFSI)
Split intake or boost hose on bank 2
Leaking intake manifold gasket on bank 2
Crankcase ventilation valve not sealing

Symptoms

  • Check engine or exhaust warning light on
  • Whistling noise from the engine bay
  • Rough idle or misfire codes

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

intake manifold b2intake hoses b2intake gaskets b2crankcase breather

Related codes

P2279P0174P2189P0507

References: static.nhtsa.gov, static.nhtsa.gov.