Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

Where it lives

For P2571, the sensor sits on the circuit this code reports. The description of P2571 reports a fault at the sensor.

Check these first

• A loose or chafed catalyst temperature sensor wire
• Corrosion at the catalyst temperature sensor connector
• A failing direct ozone reduction catalyst temperature sensor
• Electrical noise on the catalyst temperature sensor circuit

What to do next

1. Read the direct ozone reduction catalyst temperature sensor on a scan tool while wiggling the harness
2. Inspect the catalyst temperature sensor wiring for chafe or looseness
3. Check the catalyst temperature sensor connector for corrosion
4. Check the sensor ground for noise or voltage drop
5. Replace the direct ozone reduction catalyst temperature sensor if the harness tests good
6. Clear the code and retest

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