How much does it cost to fix P0442?

Typical repair cost is $20–$600.

P0442 — Evaporative Emission System — Small Leak

Low Severity · Emissions

OBD-II code P0442 means your vehicle's ECU detected: Evaporative Emission System — Small Leak. Below: causes, step-by-step fixes, and repair cost — free, no signup needed.

Low severity — safe to drive in most cases. Clear the code and monitor. If it returns, have it inspected.

Typical Repair Cost

$20–$600

Parts + labor, national average

Severity

Low

Monitor — low urgency

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Common Causes of P0442

Loose gas cap
Hairline crack in EVAP hose
Bad vent valve

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How to Fix Code P0442

Check and tighten gas cap first

Smoke test EVAP system to locate leak

Replace cracked EVAP hose or vent valve

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FAQ — Code P0442

What does OBD-II code P0442 mean?

P0442 means your vehicle's onboard computer detected: Evaporative Emission System — Small Leak. This is a low-severity code in the Emissions category.

How much does it cost to fix code P0442?

Typical repair cost for P0442 is $20–$600 including parts and labor. Costs vary by vehicle make, model, and location. A free scan at AutoZone or O'Reilly is a good first step.

Can I drive my car with code P0442?

Code P0442 is low severity. In most cases you can drive normally, but clear the code and monitor whether it returns.

What are the most common causes of P0442?

The most common causes are: Loose gas cap, Hairline crack in EVAP hose, Bad vent valve. Always start with the cheapest diagnosis step before replacing parts.

Will code P0442 clear itself?

Code P0442 will clear itself after the underlying issue is fixed and the ECU completes several successful drive cycles. Clearing it without fixing the root cause only masks the problem temporarily.

Is P0442 showing on your car?

Enter your VIN for a free vehicle-specific report — recalls, specs, and market value. No signup required.

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Related Emissions Codes

P0400Exhaust Gas Recirculation Flow Malfunction P0401EGR Flow Insufficient P0402EGR Flow Excessive P0403EGR Control Circuit Malfunction P0404EGR Control Circuit Range/Performance P0410Secondary Air Injection System Malfunction

OBD-II code data is based on SAE J2012 standards and general repair industry data. Repair costs are national averages and vary by vehicle, location, and shop. Always consult a qualified mechanic for a diagnosis specific to your vehicle.