P2ADFIntake Air System Leak Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine or exhaust warning light on
- Whistling noise from the engine bay
- Rough idle or misfire codes
- Likely causes
- LikelyLeaking full-load crankcase breather line on bank 2 (Audi 4.0 TFSI)
- PossibleSplit intake or boost hose on bank 2
- PossibleLeaking intake manifold gasket on bank 2
- RareCrankcase ventilation valve not sealing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.