Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a system that helps reduce pollution when you start the engine. This system has a pump, and it's not working properly on one side of your engine.
The code P2446 indicates that the secondary air injection system pump is not operating as expected on bank 2 of the engine. This system is responsible for injecting air into the exhaust to help reduce emissions.
The Secondary Air Injection System is designed to reduce emissions by pumping fresh air into the exhaust stream to help the catalytic converter work more efficiently. Code P2446 is triggered when the Engine Control Module (ECM) detects that the air pump is not functioning properly on bank 2, which could be due to the pump being stuck or a related component failing.
• Check Engine Light is on
• Failed emissions test
• Poor engine performance during cold starts
• Faulty air injection pump
• Damaged or clogged air injection pump relay
• Blocked air injection system passages
ECM: Engine Control Module
Secondary Air Injection: A system that injects air into the exhaust to reduce emissions
• Use an OBD-II scanner to confirm the code.
• Inspect the air injection pump and relay for damage.
• Check for blockages in the air injection system passages.
• Replace the faulty air injection pump.
• Replace the damaged relay.
• Clear any blockages in the air injection system.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $700
Moderate
• Toyota Tundra
• Lexus GX470
• Toyota Sequoia
• Regularly inspect the air injection system.
• Perform routine maintenance checks.
• Keep the engine and exhaust system clean.
Emission Control System Issue
• Have your vehicle inspected by a professional.
• Avoid driving the vehicle excessively until repaired.
Check with your vehicle manufacturer for warranty coverage on emission-related components.
This code has been commonly reported in vehicles with secondary air injection systems, particularly in certain Toyota and Lexus models.
Moderate – It is important to address this issue to ensure your vehicle passes emissions tests and operates efficiently.
Driving with a malfunctioning emission system can lead to higher emissions and may be illegal in some areas.
• Engine cold start
• Vehicle stationary
The secondary air injection pump is usually located near the front of the engine or in the engine compartment.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to increased emissions and potential damage to the catalytic converter.
Q: Can I drive my car with this code?
A: While you can drive with this code, it is not recommended as it may affect emissions and engine performance.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
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.