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 special part in the car that helps clean the air isn't working right. It's like when a filter in your vacuum cleaner gets clogged and doesn't clean as well.
The P2572 code indicates an issue with the sensor circuit that monitors the direct ozone reduction catalyst. This catalyst helps reduce ozone emissions from the vehicle.
The direct ozone reduction catalyst is part of the vehicle's emission control system, designed to reduce harmful ozone levels. The sensor circuit monitors the efficiency of this catalyst. If the sensor detects a problem, such as deterioration or malfunction, it triggers the P2572 code.
• Check Engine Light illuminated
• Failed emissions test
• Possible decrease in fuel efficiency
• Faulty ozone reduction catalyst sensor
• Damaged or corroded wiring or connectors
• Failed ozone reduction catalyst
Catalyst: A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensor and catalyst for proper operation.
• Replace the faulty sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ozone reduction catalyst if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Honda Accord Hybrid
• Ford Fusion Hybrid
• Regular maintenance and inspections
• Use high-quality fuel
• Ensure timely replacement of air filters
Sensor Issue
• Address the issue promptly to avoid emissions test failure.
• Consult with a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for emissions-related component coverage.
This code has become more common with the increased use of advanced emission control systems in modern vehicles.
Moderate – While it may not affect immediate drivability, it can lead to emissions test failures and should be addressed soon.
Driving with a malfunctioning emission control system may violate local emissions regulations.
• Engine running at normal operating temperature
• Vehicle driven under various conditions
The direct ozone reduction catalyst and its sensor are typically located in the exhaust system, near the catalytic converter.
Q: Can I drive my car with the P2572 code?
A: Yes, but it's best to get it fixed soon to avoid failing emissions tests.
Q: Will fixing this code improve my gas mileage?
A: Possibly, as a malfunctioning emission system can affect fuel efficiency.
Budget · Enhanced code reader
A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
Good for emissions-related codes because it exposes readiness monitors and live powertrain data.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.