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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2571

P2571Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

P2571 indicates that the powertrain control module has detected an intermittent or erratic signal from the direct ozone reduction catalyst temperature sensor, which monitors the temperature of a specialized catalyst used to reduce ozone-forming emissions. The circuit voltage or resistance is jumping unpredictably rather than holding a steady value, so the computer cannot trust the sensor's readings.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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