What it means
The Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance code indicates that the sensor reading is outside expected range or performance. The code alone does not identify why.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The DOR catalyst deterioration sensor provides a signal the engine control module uses to evaluate that catalyst system. P2573 sets when the circuit is present but its reading falls outside the expected range or response for the operating conditions; it does not by itself identify a worn catalyst.
Common causes
Most likely first.
- Aged sensor with offset drift
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check engine light
How to diagnose it
- Review freeze-frame data and scan-tool readings for the DOR deterioration sensor to see when its value became implausible.
- Inspect the sensor mounting, connector, and harness for looseness, corrosion, or damage that could alter or damp the signal.
- Compare the sensor reading with related DOR data and operating conditions to determine whether the reading is consistently offset or slow to respond.
- Check the sensor signal, return, and reference circuits for abnormal resistance or connection issues against the manufacturer's specifications.
- If mounting and wiring are sound, test the deterioration sensor for drift or poor response before evaluating the control-module input.
Common fixes
- Secure the sensor mounting and connector.
- Repair corroded terminals or damaged wiring in the sensor circuit.
- Correct harness routing that strains or disturbs the sensor signal.
- Replace the DOR deterioration sensor if its output is outside the manufacturer's specification.
Can I keep driving?
The stated symptom is a check-engine light, with no limp mode indicated; driving is generally possible if the vehicle behaves normally. The DOR catalyst assessment may be unreliable until the sensor signal is corrected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.