P0442

Q: What does OBD2 code P0442 mean?

P0442 means: Evaporative Emission Control System Small Leak Detected. A small leak has been detected in the EVAP system. The most common cause is a loose fuel cap.

Evaporative Emission Control System Small Leak Detected

A small leak has been detected in the EVAP system. The most common cause is a loose fuel cap.

SeverityMinor

CategoryEmissions

Est. Repair Cost$20–$200

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Loose or faulty fuel cap
›Small crack in EVAP hose
›Faulty purge valve leaking
›Loose canister connection

⚠️ Symptoms

›Check engine light
›Faint fuel smell
›No driveability complaint

✅ How to Fix — Step by Step

Step 1:Remove and reinstall fuel cap firmly
Step 2:Inspect all EVAP hoses for small cracks
Step 3:Smoke test EVAP system
Step 4:Replace fuel cap if worn seal

💡 Pro Tip: This is the most common EVAP code — a $10 fuel cap replacement fixes it half the time.

Repair Cost Estimate

Full Repair Estimate

$20–$200

DIY Possible?

YES

Severity

Minor

Frequently Asked Questions

What does OBD2 code P0442 mean?+

P0442 stands for Evaporative Emission Control System Small Leak Detected. A small leak has been detected in the EVAP system. The most common cause is a loose fuel cap.

What causes code P0442?+

Loose or faulty fuel cap; Small crack in EVAP hose; Faulty purge valve leaking; Loose canister connection

How do I fix code P0442?+

Remove and reinstall fuel cap firmly; Inspect all EVAP hoses for small cracks; Smoke test EVAP system; Replace fuel cap if worn seal

How much does it cost to fix P0442?+

Estimated repair cost for P0442 is $20–$200.

Is P0442 DIY-friendly?+

Yes — P0442 is generally DIY-friendly with basic tools.