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 is having trouble reading the temperature sensor that helps reduce bad stuff in the air. It's like when a thermometer doesn't work right and you can't tell if it's hot or cold.
The P2571 code is triggered when the vehicle's powertrain control module (PCM) detects an intermittent or erratic signal from the direct ozone reduction catalyst temperature sensor.
The direct ozone reduction catalyst temperature sensor monitors the temperature of the catalyst responsible for reducing ozone emissions. An intermittent or erratic signal indicates that the sensor is not providing consistent data, which can affect the vehicle's emissions control system.
• Check Engine Light illuminated
• Possible decrease in fuel efficiency
• Potential increase in emissions
• Faulty temperature sensor
• Wiring issues such as frayed or damaged wires
• Poor electrical connections
PCM: Powertrain Control Module
Catalyst: A substance that speeds up a chemical reaction without being consumed
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the temperature sensor.
• Test the temperature sensor for proper operation.
• Replace the faulty temperature sensor.
• Repair or replace damaged wiring.
• Ensure all connections are secure and free of corrosion.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Toyota Prius
• Honda Civic Hybrid
• Ford Fusion Hybrid
• Regularly inspect sensor wiring for damage.
• Keep connectors clean and free of corrosion.
• Perform routine vehicle maintenance.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving long distances until the issue is resolved to prevent further damage.
Sensor issues may be covered under the vehicle's emissions warranty. Check with the manufacturer.
This code has become more common with the increase in hybrid and electric vehicles that use advanced emissions control systems.
Moderate – While the vehicle may still be drivable, addressing the issue promptly can prevent further emissions problems.
Ignoring emissions-related issues can lead to failing emissions tests and may be illegal in some areas.
• Engine at operating temperature
• Vehicle in closed-loop mode
The temperature sensor is typically located near the exhaust manifold or catalytic converter.
Q: Can I drive with a P2571 code?
A: It's possible to drive, but it's best to get it checked soon to avoid emissions problems.
Q: Will a P2571 code affect my car's performance?
A: It may slightly affect fuel efficiency and emissions, but performance might not be noticeably impacted.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.