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 sensor that checks the airflow or pressure in a part of the car's exhaust system on one side of the engine. It's like if a sensor that tells you how strong the wind is outside your house stops working right.
The P2437 code is triggered when the Engine Control Module (ECM) detects a low voltage signal from the secondary air injection system's air flow or pressure sensor on Bank 2.
The secondary air injection system is designed to reduce emissions by injecting air into the exhaust stream to help burn off excess hydrocarbons. Bank 2 refers to the side of the engine that does not contain cylinder 1. The sensor in question monitors the air flow or pressure, and a low circuit signal can indicate an electrical issue, a faulty sensor, or a problem with the air system itself.
• Check Engine Light illuminated
• Possible reduction in engine performance
• Increased vehicle emissions
• Faulty air flow/pressure sensor
• Wiring issues such as a short or open circuit
• Faulty secondary air injection pump
ECM: Engine Control Module
Secondary Air Injection: A system that reduces emissions by injecting air into the exhaust stream
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the air flow/pressure sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty air flow/pressure sensor.
• Check and replace the secondary air injection pump if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Lexus RX350
• Honda Accord
• Regular maintenance checks
• Ensure wiring and connectors are intact
• Routine inspection of the air injection system
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Consider preventive maintenance to avoid future issues.
Most vehicles have emissions-related components covered under warranty for a specific period. Check with the manufacturer for details.
P2437 is a relatively common code associated with vehicles that have secondary air injection systems, often due to sensor or wiring issues.
Moderate – While the vehicle may still run, it can lead to increased emissions and potential engine performance issues.
Driving with a malfunctioning emissions system can lead to failing emissions tests and may be illegal in some areas.
• Engine at operating temperature
• Secondary air injection system active
The air flow/pressure sensor for Bank 2 is typically located near the secondary air injection pump or in the exhaust manifold on the side of the engine opposite cylinder 1.
Q: Can I drive with a P2437 code?
A: While the car might still run, it's not recommended as it can increase emissions and potentially affect engine performance.
Q: How do I know if the sensor is faulty?
A: A professional can test the sensor with a multimeter to check for proper voltage and operation.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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Universal · Wire connectors and repair kit
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.
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.