Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the car's system that checks for gas leaks. It's like a sensor isn't working right, so the car can't tell if there's a leak.
The P2404 code indicates an issue with the electrical circuit of the EVAP system's leak detection pump. The system monitors for fuel vapor leaks and ensures proper operation.
The EVAP (Evaporative Emission Control) system prevents fuel vapors from escaping into the atmosphere. The leak detection pump is part of this system and checks for leaks. The P2404 code is triggered when the sensor circuit for this pump is out of its expected range or performance parameters, indicating a potential issue with the circuit or the pump itself.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump
• Damaged or corroded wiring or connectors
• Faulty sensor in the EVAP system
EVAP: Evaporative Emission Control System
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connectors of the EVAP system for damage.
• Test the leak detection pump for proper operation.
• Replace or repair damaged wiring or connectors.
• Replace the leak detection pump if faulty.
• Clear the code and test drive to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Ford Focus
• Honda Accord
• Regular maintenance checks
• Ensure gas cap is properly sealed
• Inspect EVAP system components periodically
Sensor Issue
• Don't ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regularly maintain the vehicle to prevent such issues.
Check with the vehicle manufacturer for warranty coverage on emission-related components.
The P2404 code has been more common in vehicles with higher mileage or those frequently driven in harsh conditions.
Moderate – It should be addressed to prevent potential emissions issues.
Ignoring emissions-related codes can lead to failed emissions tests and potential fines.
• Engine at operating temperature
• Vehicle parked on a level surface
The leak detection pump is typically located near the fuel tank or within the EVAP canister.
Q: Can I drive with a P2404 code?
A: Yes, but it's recommended to fix it soon to avoid emissions problems.
Q: Will a P2404 code affect my car's performance?
A: It may not affect performance directly, but it can cause emissions issues.
Budget · Enhanced code reader
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 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.