P0442
EVAP System Leak Detected (small leak)
Powertrain · Generic (all makes)System: Emissions
Safe to drive short term. Book a repair.
Likely causes
- Loose or worn gas cap seal
- Small cracked EVAP hose
- Purge or vent valve not sealing
What to check first
A small EVAP leak: replace the gas cap first, then smoke-test if it comes back.
Typical repair cost
$50 – $450
Independent-shop parts and labor for the usual fix. Your price depends on the actual cause and the vehicle.
Next step
General information, not a diagnosis of your vehicle. Repair costs are typical shop ranges, not quotes.