Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
The P2572 code indicates a malfunction in the sensor circuit that monitors the deterioration of the direct ozone reduction catalyst, typically found in diesel vehicles with SCR systems. This sensor measures the catalyst's ability to convert ozone into oxygen. A circuit fault (e.g., open, short, or out-of-range signal) triggers the code, often due to wiring issues, sensor failure, or contamination.
1. Most Common Causes
- Faulty or degraded direct ozone reduction catalyst deterioration sensor
- Corroded, shorted, or open sensor wiring or connectors
- ECM/PCM failure
- Contaminated or physically damaged direct ozone reduction catalyst
- Loose electrical connections or excessive resistance in the sensor circuit
- Moisture or water ingress in the sensor connector
2. Symptoms You Will Notice
- Check Engine Light on
- Possible reduced fuel efficiency
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect sensor wiring and connector for damage or corrosion.
Step 3: Test sensor signal voltage with a multimeter (refer to manufacturer specs).
Step 4: Check for exhaust leaks upstream of the sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and could lead to catalyst damage if ignored. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees if done by a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.