The P2573: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance code indicates that the sensor monitoring the direct ozone reduction catalyst is detecting values that are out of the normal operating range or showing performance issues. This could be due to a faulty sensor, poor connections, or wiring problems that are affecting the signal quality.
P2573 – Quick Overview
Code | Information |
---|---|
Meaning | P2573: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance |
Is it serious? | Yes, as range or performance issues with the sensor can prevent the proper monitoring of the catalyst’s condition, reducing the effectiveness of emissions control. |
Possible causes | – Range or performance issues with the direct ozone reduction catalyst deterioration sensor circuit – Faulty direct ozone reduction catalyst deterioration sensor – Wiring or connector problems |
How to diagnose? | – Test the range and performance of the direct ozone reduction catalyst deterioration sensor circuit – Inspect and test the direct ozone reduction catalyst deterioration sensor – Check wiring and connectors – Replace faulty components if needed |
P2573 Meaning
The P2573: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance code means that the readings from the sensor monitoring the catalyst are outside of the expected performance range. This can indicate that the sensor is malfunctioning or that the catalyst is not functioning properly. Issues could arise from problems with the sensor itself, incorrect wiring, or poor electrical connections that result in erratic or incorrect signals being sent to the Engine Control Module (ECM).
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Related Codes | Use an OBD-II scanner to determine if there are additional codes related to the emissions system or the catalyst sensor that might help identify the issue. | OBD-II Scanner |
Test the Range and Performance of the Catalyst Deterioration Sensor Circuit | Use a multimeter or diagnostic tool to measure the output from the catalyst deterioration sensor. Compare the readings against manufacturer specifications to verify if the sensor is working within the expected range. | Multimeter, Diagnostic Tool |
Inspect the Catalyst Deterioration Sensor | Visually inspect the sensor for any signs of damage, corrosion, or dirt that could be affecting its ability to measure the catalyst’s condition. Ensure it is securely mounted. | Flashlight, Safety Gloves |
Test the Direct Ozone Reduction Catalyst Deterioration Sensor | Use a diagnostic tool to observe the live data from the sensor during various engine conditions. Verify that the readings are stable and within the specified parameters. If the sensor fluctuates or shows incorrect values, it may be faulty. | Diagnostic Tool, Multimeter |
Check Wiring and Connectors | Inspect all wiring and connectors associated with the sensor. Look for frayed wires, corrosion, loose connections, or short circuits that could affect signal quality and result in an incorrect performance range. | Flashlight, Multimeter |
Repair or Replace Faulty Wiring/Connectors | Repair any damaged wiring or replace corroded connectors to restore proper electrical continuity. All connections should be tight and corrosion-free for accurate signal transmission. | Basic Tools, Replacement Parts |
Replace the Faulty Catalyst Deterioration Sensor | If testing shows that the sensor is not operating correctly or its output is inconsistent, replace it with a new sensor. Ensure the replacement sensor is properly calibrated and installed. | Replacement Catalyst Deterioration Sensor |
Clear the Code and Test Drive | After repairs are complete, use an OBD-II scanner to clear the fault code. Drive the vehicle to ensure proper operation of the emissions system, checking that the sensor reads correctly and that no error codes return. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle after the test drive to confirm that the P2573 code has been resolved. If the code persists, further diagnostics may be required to determine the underlying issue. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)