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 a part of your car's system that helps reduce pollution is not closing properly, kind of like a door that's stuck open when it should be closed.
The P2440 code indicates that the secondary air injection system's switching valve for bank 1 is stuck open.
The secondary air injection system is designed to reduce emissions by injecting fresh air into the exhaust system during cold starts. The system uses switching valves to control the flow of air. When the valve is stuck open, it can cause improper air flow and increased emissions.
• Check Engine Light is on
• Increased emissions
• Poor engine performance
• Faulty air switching valve
• Damaged or leaking vacuum hoses
• Faulty air pump
AIR System: Secondary Air Injection System, used to reduce emissions.
Bank 1: The side of the engine with cylinder 1, typically the driver's side in a V-engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the air switching valve and related hoses for damage.
• Test the functionality of the air pump.
• Replace the faulty air switching valve.
• Repair or replace damaged vacuum hoses.
• Replace the air pump if necessary.
• OBD-II scanner
• Vacuum gauge
• Wrench set
$150 - $500
Moderate
• Toyota Tacoma
• Lexus GX470
• Toyota Tundra
• Regularly inspect and maintain the air injection system.
• Replace air filters as recommended.
• Check for vacuum leaks periodically.
Emission Control Issue
• Have your vehicle inspected by a professional mechanic.
• Avoid driving with the Check Engine Light on for extended periods.
• Regular maintenance can prevent this issue.
Check with your vehicle manufacturer, as emissions-related components may have an extended warranty.
The P2440 code has been more common in vehicles with secondary air injection systems, especially in certain Toyota and Lexus models.
Moderate – While the vehicle may still be drivable, it's important to address this issue to prevent increased emissions and potential engine damage.
Driving with a malfunctioning emissions system may violate local emissions laws and can contribute to environmental pollution.
• Engine at operating temperature
• Cold start conditions
The air switching valve is typically located near the engine, connected to the exhaust manifold.
Q: Can I drive with a P2440 code?
A: While you can drive with this code, it's best to have it fixed to avoid increased emissions and potential engine damage.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can reset the light using an OBD-II scanner, or it may turn off automatically after several drive cycles if the issue is resolved.
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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.
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.