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 computer thinks the special part that cleans the car's exhaust (called the catalyst) isn't getting hot enough on one side of the engine.
The P0424 code indicates that the temperature of the heated catalyst in Bank 1 is below the required threshold, which can affect emissions control.
The heated catalyst is a component in the exhaust system that helps reduce harmful emissions. It needs to reach a certain temperature to work effectively. The P0424 code is triggered when the temperature sensor detects that the catalyst is not reaching this temperature in Bank 1, which is the side of the engine with cylinder 1.
• Check Engine Light is on
• Increased emissions
• Possible reduction in fuel efficiency
• Faulty heated catalyst
• Wiring issues or poor electrical connections
• Faulty temperature sensor
Catalyst: A component that helps reduce vehicle emissions.
Bank 1: The side of the engine where cylinder 1 is located.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the heated catalyst.
• Check the functionality of the temperature sensor.
• Replace the heated catalyst if defective.
• Repair or replace damaged wiring or connectors.
• Replace the temperature sensor if faulty.
• OBD-II scanner
• Multimeter
• Wrench set
$300 - $1200
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regular vehicle maintenance
• Ensure proper fuel quality
• Periodic inspection of the exhaust system
Emissions Control
• Have the vehicle inspected by a professional.
• Avoid prolonged driving if the Check Engine Light is flashing.
Check with the vehicle manufacturer for emissions-related warranty coverage.
Historically, this code has been less common and often related to specific vehicle models with known exhaust system issues.
Moderate – Addressing this issue helps maintain emissions standards and vehicle efficiency.
Ignoring emissions-related codes can result in failing emissions tests and increased pollution.
• Engine at operating temperature
• Vehicle driven under normal conditions
The heated catalyst is located in the exhaust system, typically near the engine on Bank 1.
Q: Can I drive with a P0424 code?
A: While you can drive with this code, it's best to have it checked soon to avoid potential emissions issues.
Q: How does a heated catalyst work?
A: A heated catalyst helps reduce harmful emissions by converting them into less harmful substances using heat.
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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 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.