P0442
Category: Powertrain
Urgency:
Moderate Severity
P0442: EVAP System Leak Detected (Small Leak)
Code P0442 indicates that the evaporative emission control (EVAP) system detected a small vapor leak (typically 0.020 to 0.040 inches) in fuel vapor lines.
Common Symptoms of P0442
- • Check Engine Light on
- • Faint gasoline vapor smell near fuel tank
- • No noticeable loss in driving performance
Root Causes for Code P0442
- • Loose, worn, or cracked fuel filler gas cap
- • Cracked or disconnected EVAP vapor hose
- • Faulty EVAP canister purge valve or vent solenoid
- • Cracked charcoal vapor canister
Step-by-Step DIY Diagnostic & Inspection Guide
1
Remove, inspect rubber O-ring seal, and retighten gas cap until it clicks.
2
Inspect EVAP solenoid valves for debris and test with 12V power.
3
Perform an EVAP low-pressure smoke test.
Estimated Repair Costs
Replacement Parts:
$15 - $120
Shop Diagnostic / Labor:
$50 - $150
Total Estimated Cost:
$65 - $270
Need to check if your vehicle has open safety recalls or technical service bulletins (TSBs)?
Check Vehicle VIN Now