Audi P0455 Code — EVAP System Large Leak Detected

The P0455 code on your Audi indicates a large leak in the EVAP system.

What It Means

The EVAP system has lost pressure due to a significant leak.

👉 Compared to P0442:

  • leak is larger
  • issue is usually more serious

Common Causes

1. Missing or Damaged Gas Cap

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7

Most common cause.

2. Major EVAP Hose Damage

5

Causes:

  • broken hose
  • disconnected line
  • severe wear

3. Faulty Purge Valve

  • stuck open
  • unable to hold pressure

4. Damaged Charcoal Canister

  • cracks
  • structural damage

Symptoms

  • check engine light
  • fuel smell
  • possible starting issues

Step-by-Step Fix

  1. Check gas cap
  2. Inspect hoses
  3. Test purge valve
  4. Scan codes
  5. Perform smoke test

How much does the repair cost?

Cover: $10–30

Valve: $50-150

System repair: up to $300+

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