What Does P2573 Mean?
The deterioration sensor monitoring the Direct Ozone Reduction catalyst is providing readings outside the expected range or showing abnormal performance characteristics. The sensor is functioning but not providing credible data.
Common Causes
35%
Degraded or contaminated sensor element
25%
Exhaust leaks near sensor affecting readings
20%
Sensor installed incorrectly or wrong sensor type
15%
High resistance in sensor circuit wiring
5%
Carbon buildup or contamination on sensor
Diagnostic Steps
1
Step 1: Compare sensor readings to expected values in service data at various engine operating conditions
2
Step 2: Inspect exhaust system for leaks near sensor location using smoke machine or visual inspection
3
Step 3: Remove sensor and inspect element for carbon buildup, oil contamination, or physical damage
4
Step 4: Verify correct sensor part number is installed for vehicle application
5
Step 5: Monitor sensor response time and voltage swing during engine load changes
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
The deterioration sensor monitoring the Direct Ozone Reduction catalyst is providing readings outside the expected range or showing abnormal performance characteristics. The sensor is functioning but not providing credible data.
The most common cause of P2573 (Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance) is: Degraded or contaminated sensor element
Typical repair costs for P2573 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Emissions monitoring capability is compromised and may fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2573 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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