What does code P0440 mean on a Audi and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Audi, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your Audi
- Gas cap loose or faulty
- Purge or vent valve stuck
- Charcoal canister or hose leak
Symptoms
- Check Engine Light
Typical fixes
- Replace gas cap
- Test purge/vent valves
- Smoke test EVAP system
Repair cost range
For a Audi, repairs for P0440 often fall between $20 and $400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Audi
Audi P0440 EVAP system large leak is commonly the gas cap or a cracked charcoal canister hose. Use VCDS to activate the leak detection pump and check its operation. Audi's EVAP system uses a leak detection pump (LDP) that can develop an internal diaphragm failure—test the LDP before smoke testing.
Most commonly affected models