P2571: Direct Ozone Reduction Catalyst Temp Sensor Circuit Intermittent
The P2571 code indicates an intermittent or erratic signal from the direct ozone reduction catalyst temperature sensor circuit. This sensor monitors the temperature of the catalyst used in diesel exhaust aftertreatment systems to reduce ozone. An intermittent signal can be caused by wiring issues, poor connections, or a failing sensor. The PCM uses this input for emissions control; erratic readings may affect system performance and trigger the check engine light.
01. Most Common Causes
- Faulty direct ozone reduction catalyst temperature sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Intermittent short or open in the sensor circuit
- Poor electrical connection at the sensor or PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible decreased fuel efficiency
- Possible failed emissions test
- Intermittent or no drivability issues
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output with a multimeter and compare to manufacturer specs.
Step 4: If wiring and sensor are okay, check for intermittent issues by wiggling harnesses while monitoring live data.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and reduced fuel economy. Have it diagnosed soon to prevent further issues.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and sensor replacement, but costs vary by vehicle and labor rates.