What Does P2571 Mean?
The PCM has detected an intermittent or erratic signal from the temperature sensor monitoring the Direct Ozone Reduction catalyst. This indicates unstable voltage readings that fall outside expected parameters sporadically.
Common Causes
35%
Corroded or loose connector at temperature sensor
30%
Damaged or chafed wiring between sensor and PCM
25%
Failing temperature sensor with internal intermittent fault
10%
Poor ground connection in sensor circuit
Diagnostic Steps
1
Step 1: Visually inspect the catalyst temperature sensor connector for corrosion, moisture, or loose pins
2
Step 2: Perform a wiggle test on wiring harness while monitoring live sensor data to replicate intermittent fault
3
Step 3: Check sensor resistance and voltage output against manufacturer specifications at various temperatures
4
Step 4: Verify ground circuit continuity and resistance (should be less than 1 ohm)
5
Step 5: Monitor sensor signal with oscilloscope for dropouts or noise during temperature changes
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The PCM has detected an intermittent or erratic signal from the temperature sensor monitoring the Direct Ozone Reduction catalyst. This indicates unstable voltage readings that fall outside expected parameters sporadically.
The most common cause of P2571 (Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic) is: Corroded or loose connector at temperature sensor
Typical repair costs for P2571 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. May experience reduced fuel economy and potential emissions test failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2571 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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