P0442
Evaporative Emission Control System Leak Detected (Small Leak)
Description
Evaporative Emission Control System Leak Detected (Small Leak). This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Failed catalytic converter, leaking EVAP hoses or purge valve, clogged EGR passages, faulty oxygen sensor
Solution
Check upstream and downstream oxygen sensor readings, smoke-test the EVAP system, inspect the EGR passages and valve, evaluate catalyst efficiency
Symptoms
- Check engine light illuminated
- Faint fuel odor near the fuel filler area
- No noticeable performance issues in most cases
- Failed emissions test
- Fuel cap may not seal properly
Diagnostic Recommendations
- Check fuel cap for proper sealing and replace if damaged
- Perform a smoke test to locate small EVAP leaks
- Inspect EVAP hoses and connections for cracks
- Test purge and vent valve operation
- Check charcoal canister for damage
Repair Cost Estimate
- Fuel cap replacement: $20-50
- Smoke test diagnostic: $80-150
- EVAP hose replacement: $50-200
- Purge/vent valve replacement: $100-250
- Total diagnostic and repair: $150-600
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Fact-checking completed
Verified by:
Pavel Volkov
Created:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
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