What does code P0440 mean on a Porsche and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Porsche, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your Porsche
- 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 Porsche, 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 Porsche
Porsche P0440 EVAP system fault on older platforms—gas cap first, then the N80-style purge valve. On first-gen Cayenne, the EVAP canister is mounted under the vehicle and exposed to road wash; inspect it for cracks.
Most commonly affected models
Cayenne 2003–2010911 2002–2011Boxster 2002–2012