P2573 - Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
The P2573 code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the direct ozone reduction catalyst deterioration sensor circuit. This sensor monitors the efficiency of the catalyst that reduces ozone (O3) into oxygen (O2). The code is set when the sensor signal is out of the expected range or performance parameters, often due to a faulty sensor, wiring issues, or a degraded catalyst. This can lead to increased emissions and potential failure of emissions-related components.
1. Most Common Causes
- Faulty direct ozone reduction catalyst deterioration sensor
- Sensor wiring shorted or open circuit
- Loose, corroded, or poor electrical connections
- Low sensor supply voltage (reference circuit issue)
- Damaged or incorrectly programmed PCM
2. Symptoms You Will Notice
- Illuminated Check Engine Light
- Failed emissions test
- Possible decrease in fuel efficiency
- Rough engine idle or performance issues (less common)
3. Step-by-Step Diagnosis
Step 1: Connect a scan tool and retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the sensor's voltage and resistance per manufacturer specifications.
Step 4: Check for exhaust leaks upstream of the sensor using a smoke machine or visual inspection.
Step 5: If sensor and wiring are okay, test the catalyst efficiency using a scan tool or exhaust gas analyzer.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
While the vehicle may still be drivable, it is not recommended to drive for extended periods as it can cause increased emissions and potential damage to the catalytic converter. It is best to diagnose and repair the issue promptly.
How much does it cost to fix?▼
The cost to fix P2573 typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if the catalyst needs replacement or if there are wiring repairs needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.