P0442
PowertrainEvap Systemlow severityEVAP System Leak Detected (Small Leak)
What P0442 Means
A small leak has been detected in the EVAP system.
Symptoms
- Check Engine Light
- Slight fuel smell possible
Common Causes
- Loose gas cap
- Small crack in EVAP hose
- Faulty purge or vent valve seal
- Charcoal canister micro-crack
- Fuel tank leak
Diagnostic Steps
- Tighten gas cap and clear code
- If returns, perform smoke test on EVAP system
- Inspect all EVAP hoses
- Check purge and vent valve seals
- Inspect charcoal canister
Where to start: Check gas cap first. Small leaks often require smoke test to find.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Related Codes
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0442?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix