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 sensor in your car that helps reduce pollution is not working right. It's like when a toy's battery is low and it can't work properly.
The P2574 code indicates that the sensor responsible for monitoring the direct ozone reduction catalyst is reporting a low voltage signal, which suggests a potential issue with the sensor or its circuit.
The Direct Ozone Reduction Catalyst Deterioration Sensor monitors the efficiency of the catalyst that reduces ozone emissions in the vehicle's exhaust system. A low circuit signal indicates that the sensor is not receiving enough voltage, which could be due to wiring issues, a faulty sensor, or a problem with the catalyst itself.
• Check Engine Light illuminated
• Increased emissions
• Possible decrease in fuel efficiency
• Faulty Direct Ozone Reduction Catalyst Deterioration Sensor
• Wiring issues such as open or short circuits
• Faulty 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 P2574 code.
• Inspect the wiring and connectors for the sensor.
• Test the sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the Direct Ozone Reduction Catalyst Deterioration Sensor if faulty.
• Inspect and possibly replace the catalyst if it is not functioning properly.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Honda Civic Hybrid
• Ford Fusion Hybrid
• Regular maintenance and inspection of the exhaust system.
• Ensure all sensors are functioning properly.
• Address any Check Engine Light issues promptly.
Sensor Issue
• Have the vehicle inspected by a professional as soon as possible.
• Avoid driving the vehicle extensively until the issue is resolved to prevent further damage.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been reported in vehicles with advanced emissions control systems, particularly in hybrid and electric vehicles.
Moderate – It is important to address this issue to ensure the vehicle meets emissions standards and operates efficiently.
Driving with this code could lead to increased emissions, which may not comply with local environmental regulations.
• Engine running
• Vehicle at operating temperature
The sensor is typically located near the catalytic converter in the exhaust system.
Q: Can I drive my car with a P2574 code?
A: It's best to have the issue checked out soon to avoid increased emissions and potential damage.
Q: What happens if I ignore the P2574 code?
A: Ignoring the code can lead to higher emissions and possibly reduced fuel efficiency.
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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.