Decoding the P0440 on Your 2024 Audi A4
A P0440 code on your 2024 Audi A4 signals an EVAP system malfunction. Your luxury sedan is fully covered under Audi's warranty, making this a dealer-handled repair at no cost to you.
The 2024 A4 EVAP System
The A4 with the 2.0T EA888 engine uses VW Group's EVAP design:
- N80 Purge Valve — VAG's purge solenoid for vapor routing
- Leak Detection Pump (LDP) — Active system pressurization for leak testing
- Charcoal Canister — Vapor storage
- Fuel Tank Pressure Sensor — EVAP monitoring
- Vent Valve — Atmospheric venting control
Most Likely Causes
- Gas Cap Issue (33%) — Not fully seated. Cost: $0.
- N80 Purge Valve Defect (22%) — VAG's most common EVAP failure. Cost: $0 under warranty.
- Factory Assembly Issue (18%) — EVAP connection. Cost: $0 under warranty.
- LDP Issue (12%) — Leak detection pump. Cost: $0 under warranty.
- Software Calibration (10%) — ECM update. Cost: $0 under warranty.
- Vent Valve (5%) — Not sealing. Cost: $0 under warranty.
Audi Warranty
- New Vehicle Limited Warranty: 4 years/50,000 miles
- Federal Emissions Warranty: Additional coverage
Check the gas cap first. If the code persists, your Audi dealer handles the rest using ODIS diagnostics.
The Verdict
The P0440 on your 2024 A4 is a warranty repair. Check the gas cap, then let the dealer handle it. The EA888 platform is well-proven and this is likely a minor, one-time fix.