What does code P0442 mean on a Porsche and is it safe to drive?
P0442: Evaporative Emission System Leak Detected (Small Leak). Here's what it means on your Porsche, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainLow urgency
What this code means
The EVAP system has detected a small leak. Often caused by a loose or faulty gas cap or a small hose leak.
Common causes for your Porsche
- Loose, damaged, or wrong gas cap
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Leaking charcoal canister
Symptoms
- Check Engine Light
- Often no driveability issues
Typical fixes
- Tighten or replace gas cap
- Smoke test EVAP system
- Replace damaged hoses or valves
Repair cost range
For a Porsche, repairs for P0442 often fall between $15 and $300, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Porsche
Porsche P0442 follows VW/Audi EVAP diagnostic procedures on shared platforms. On Cayenne, the EVAP canister is mounted under the vehicle and can be damaged from off-road use or debris. Smoke test before condemning any component.
Most commonly affected models
Cayenne 2011–2018Macan 2015–2019