Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's system that checks for leaks in the fuel system isn't working right. It's like if you had a straw with a hole in it, and the air can't pass through properly.
The P043E code is triggered when the Engine Control Module (ECM) detects that the flow through the EVAP system's reference orifice is lower than expected.
The EVAP (Evaporative Emission Control) system is designed to prevent fuel vapors from escaping into the atmosphere. The system includes a reference orifice that helps detect leaks by measuring air flow. If the ECM detects that the flow through this orifice is too low, it sets the P043E code.
• Check Engine Light is on
• Failed emissions test
• Possible fuel odor
• Clogged or restricted EVAP canister
• Faulty EVAP purge valve
• Damaged or leaking EVAP hoses
EVAP: Evaporative Emission Control
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the EVAP canister for clogs or damage.
• Check the EVAP purge valve for proper operation.
• Replace or clean the EVAP canister if clogged.
• Replace the EVAP purge valve if faulty.
• Repair or replace damaged EVAP hoses.
• OBD-II scanner
• Vacuum pump
• Multimeter
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect the EVAP system components.
• Ensure fuel cap is tightly secured.
• Avoid overfilling the fuel tank.
Emission Control System Issue
• Avoid driving with a full tank to prevent excess pressure.
• Regularly check for fuel odors around the vehicle.
• Schedule regular maintenance checks.
Check your vehicle's emissions warranty, as some components may be covered.
This code has been more prevalent in vehicles with older EVAP systems, often due to wear and tear.
Moderate – It may not affect immediate drivability but should be addressed to prevent emissions issues.
Driving with this code may cause your vehicle to fail emissions testing, which is required by law in many areas.
• Vehicle should be at operating temperature.
• Perform tests in a well-ventilated area.
The EVAP system components are usually located near the fuel tank or in the engine bay.
Q: Can I drive with a P043E code?
A: Yes, but it's best to fix it soon to avoid failing emissions tests.
Q: Will a P043E code affect my gas mileage?
A: It might slightly affect fuel efficiency if the EVAP system isn't working properly.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
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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.