Investigating the P0440 on Your 2022 Audi A6
The P0440 code on your 2022 Audi A6 indicates an EVAP system malfunction. Your C8-platform executive sedan, available with the 2.0T or 3.0T engine, uses VW Group's well-established EVAP architecture.
The A6 EVAP System
Your 2022 A6 uses VAG EVAP components:
- N80 Purge Valve — Electronically controlled purge solenoid for vapor routing
- Leak Detection Pump (LDP) — Active leak testing system
- Charcoal Canister — Activated carbon vapor storage
- Fuel Tank Pressure Sensor — EVAP diagnostic monitoring
- Vent Valve — Atmospheric air control
- Fuel Filler Cap — Primary system seal
Ranked Suspects
- Gas Cap Seal (28%) — Rubber gasket degradation. Cost: $15–$38.
- N80 Purge Valve (25%) — VAG's most common EVAP failure. Cost: $45–$90, $135–$290 with labor.
- Leak Detection Pump (18%) — Electrical or mechanical failure. Cost: $75–$145, $185–$380 with labor.
- EVAP Hose Issues (14%) — Heat and age. Cost: $15–$45, $80–$210 with labor.
- Charcoal Canister (10%) — Saturation. Cost: $135–$290, $240–$480 installed.
- Fuel Tank Pressure Sensor (5%) — Erratic readings. Cost: $60–$125, $145–$290 installed.
Diagnostic Steps
- Gas Cap — Inspect, clean, reseat or replace.
- VCDS/OBDeleven — Run N80 output test, check companion codes and freeze frame data.
- N80 Test — Verify clicking, resistance, vacuum holding.
- LDP Test — Verify pump activation.
- Smoke Test — $80–$150 for leak detection.
Warranty and DIY
Warranty: Audi's 4-year/50,000-mile warranty may still cover your 2022 A6. Verify with your dealer.
The A6's engine bay provides good access for EVAP components. VCDS is essential for proper VW/Audi diagnostics.
The Verdict
Your 2022 A6's P0440 follows the standard VAG diagnostic path — gas cap, N80 purge valve, LDP. Both the 2.0T and 3.0T share the same EVAP architecture. Check warranty for a free repair.