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 a sensor in your car that checks how well a special part is cleaning the air. It's like if your vacuum cleaner's filter isn't working right, and a sensor tells you about it.
The P2573 code is triggered when the vehicle's engine control module (ECM) detects an issue with the sensor circuit responsible for monitoring the direct ozone reduction catalyst's performance.
The direct ozone reduction catalyst is designed to reduce ozone emissions from the vehicle. The sensor circuit monitors the efficiency of this catalyst. If the sensor detects a performance issue or an out-of-range signal, the ECM sets the P2573 code.
• Check Engine Light is on
• Possible decrease in fuel efficiency
• Emission test failure
• Faulty direct ozone reduction catalyst
• Damaged or corroded sensor wiring or connectors
• Malfunctioning sensor
ECM: Engine Control Module
Catalyst: A device that reduces vehicle emissions
• Scan the vehicle for codes and note any other related codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty sensor.
• Replace the direct ozone reduction catalyst if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Honda Civic Hybrid
• Ford Fusion Hybrid
• Regular vehicle maintenance
• Timely replacement of sensors
• Routine emission system checks
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving extensively until the issue is resolved to prevent further damage.
Check with your vehicle manufacturer for specific warranty coverage related to emissions components.
The P2573 code has been observed in hybrid and low-emission vehicles due to their advanced emission control systems.
Moderate – It should be addressed soon to maintain vehicle efficiency and emissions compliance.
Driving with this code may lead to increased emissions, which could violate local environmental regulations.
• Engine running
• Vehicle at operating temperature
The direct ozone reduction catalyst sensor is typically located near the catalytic converter in the exhaust system.
Q: Can I drive with a P2573 code?
A: It's not recommended to drive extensively with this code, as it may lead to increased emissions and potential damage to the vehicle.
Q: How do I clear a P2573 code?
A: After repairs, use an OBD-II scanner to clear the code. Ensure the issue is resolved to prevent it from returning.
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Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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.