Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer thinks there's a tiny hole somewhere in the system that keeps gas fumes from escaping. It's like having a small leak in a balloon.
The EVAP (Evaporative Emission Control) system prevents fuel vapors from escaping into the atmosphere. A very small leak has been detected on the fuel tank side of this system.
The P04EE code indicates that the vehicle's onboard diagnostics have detected a very small leak in the EVAP system, specifically on the fuel tank side. This could be due to a faulty gas cap, a small crack in the fuel tank, or a leak in the hoses or valves connected to the fuel tank.
• Check Engine Light is on
• Slight smell of gasoline
• Reduced fuel efficiency
• Faulty or loose gas cap
• Cracked or damaged fuel tank
• Leaking EVAP hoses or valves
EVAP: Evaporative Emission Control
OBD-II: On-Board Diagnostics, Second Generation
• Inspect the gas cap for damage and ensure it is tight.
• Perform a smoke test to identify leaks in the EVAP system.
• Check for cracks or damage in the fuel tank and EVAP hoses.
• Replace or tighten the gas cap.
• Repair or replace damaged EVAP hoses.
• Seal or replace a cracked fuel tank.
• OBD-II scanner
• Smoke machine
• Wrench set
$100 - $600
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly check and tighten the gas cap.
• Inspect EVAP hoses for wear and tear.
• Schedule routine maintenance checks.
Emission Control Issue
• Ensure the gas cap is properly secured after refueling.
• Have regular inspections of the EVAP system.
• Address the issue promptly to avoid more significant problems.
This issue may be covered under the vehicle's emissions warranty. Check with your manufacturer.
EVAP system leak codes have been common as emissions standards have become stricter, requiring more sensitive detection of leaks.
Moderate – While not immediately dangerous, it should be addressed to prevent environmental harm and potential worsening of the issue.
Driving with a leak in the EVAP system can increase emissions and may be illegal in some regions due to environmental regulations.
• Vehicle at operating temperature
• System pressure test
The EVAP system components are located near the fuel tank, often at the rear of the vehicle.
Q: Can I drive with a P04EE code?
A: Yes, but it's best to fix it soon to avoid increased emissions and potential fuel efficiency loss.
Q: Will a loose gas cap cause a P04EE code?
A: Yes, a loose or damaged gas cap is a common cause of this code.
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A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
Good for emissions-related codes because it exposes readiness monitors and live powertrain data.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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Fitment Required · Vehicle-fitment part
Relevant for some EVAP leak codes where the fuel cap or sealing surface is part of the problem.
Some EVAP leak faults involve the fuel cap or its sealing surface.
Fuel caps vary by vehicle and should be matched to the exact application.
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Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.