P2573
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
Emissions — ozone reduction catalyst
Generic OBD-II
Low
What it means
P2573 means the sensor that monitors the direct ozone reduction catalyst — a coating that converts ground-level ozone as air passes through — is reading outside its expected range. This is an emissions-monitoring fault, so it has no effect on how the car drives; it mainly matters for passing emissions and clearing the check-engine light.
Low
Can I keep driving? Yes — this monitors an emissions catalyst and has no effect on how the car runs; repair it mainly to pass emissions and clear the light.
Common symptoms
What you'll notice
- Check-engine light on or a stored code
- No change in how the car drives
- May fail an emissions test or block monitor readiness
Common causes
Most likely first
- Out-of-range signal from the ozone-reduction catalyst deterioration sensorLikely
- Damaged wiring or connectorCommon
- Poor or corroded electrical connectionCommon
- Faulty deterioration sensorLess often
- Deteriorated catalyst coatingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the fault set.
- Inspect the sensor wiring and connector for damage or corrosion.
- Compare the sensor signal to specification.
- Check the sensor and catalyst mounting.
- Replace the sensor if it reads out of range, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2573?+
Yes — this monitors an ozone-reduction emissions catalyst and doesn't affect drivability. The main reason to fix it is emissions compliance and clearing the light.
Can I just clear P2573?+
It returns once the monitor re-runs unless the sensor, wiring, or catalyst is repaired.
Related codes
Often seen with P2573
Read & clear P2573 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX