P2573: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
The P2573 code indicates a problem with 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 sets when the sensor signal is out of the expected range or performance parameters, often due to a faulty sensor, wiring issues, or a deteriorated catalyst. This can affect emissions and may trigger the check engine light.
01. Most Common Causes
- Faulty direct ozone reduction catalyst deterioration sensor
- Open or shorted sensor wiring or connector
- Exhaust system leaks near the sensor
- Failed catalyst (deteriorated or contaminated)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible decrease in fuel efficiency
- Possible rough idle or hesitation
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 wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and resistance with a multimeter per manufacturer specs.
Step 4: Check for exhaust leaks upstream of the sensor.
Step 5: If sensor and wiring are okay, suspect catalyst deterioration and perform a catalyst efficiency test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and potential damage to the catalyst over time. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus labor. Catalyst replacement can cost $200-$1000 or more.