P0442
EVAP System Small Leak Detected
low
i Description
A small leak has been detected in the EVAP system. The ECU performs a leak test (often overnight) and has found a leak equivalent to a 0.040-inch (1mm) hole.
? Common Causes
- Worn or cracked fuel cap seal
- Small crack in EVAP hose
- Loose hose connection
- Hairline crack in charcoal canister
- Minor fuel tank leak
! Symptoms
- Check engine light
- Slight fuel smell (sometimes)
# Diagnostic Steps
- Inspect and replace fuel cap
- Perform EVAP smoke test to locate the small leak
- Inspect all EVAP hoses and connections
- Check charcoal canister for cracks
⚙ Typical Fix
Replace fuel cap or repair the small leak found by smoke testing.
Parts Needed
Fuel cap, EVAP hose
Estimated Cost
$20-$300
↔ Related Codes
Q Frequently Asked Questions
Yes. This is a minor emissions leak with no driveability impact.
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