P0442 on Your 2024 Audi A4
A P0442 code on your 2024 Audi A4 indicates a small evaporative emission system leak. On a brand-new luxury sedan, this is typically minor — your Audi warranty covers the repair completely.
EVAP System
The 2024 A4's 2.0L TFSI uses the VAG EVAP system with an N80 purge regulator valve, charcoal canister shut-off valve, and charcoal canister. The ECM detects leaks by monitoring pressure decay.
Likely Causes
- Gas cap not fully seated (35%) — The most common trigger on newer vehicles.
- N80 purge regulator valve defect (25%) — VAG's known weak point. A factory defect in the N80's internal seal.
- EVAP connection issue (20%) — A factory fitting that wasn't fully seated.
- Charcoal canister shut-off valve defect (10%) — A factory imperfection.
- Software calibration needed (10%) — EVAP monitoring parameters may need updating.
What to Do
Reseat your gas cap. If the code persists, visit your Audi dealer. ODIS diagnostics provide comprehensive EVAP testing. All repairs are warranty-covered.
Costs ($0 Under Warranty)
- Gas cap: $25–$55
- N80 purge regulator valve: $150–$350
- EVAP hose repair: $100–$280
- Charcoal canister shut-off valve: $160–$370
Warranty
Your 2024 A4 is covered under Audi's 4-year/50,000-mile basic warranty and federal 8-year/80,000-mile emissions warranty. All P0442 repairs are free.