P2575
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High
Emissions monitoring
Generic OBD-II
Low
What it means
P2575 means the ECM sees an abnormally high voltage from the sensor that monitors the direct ozone reduction catalyst — a radiator or condenser coating that breaks down ground-level ozone. This is strictly an emissions-monitoring circuit, so the car drives normally and there are usually no symptoms beyond the warning light. The fault is almost always the sensor, its wiring, or a connector.
Low
Can I keep driving? Yes — this is an emissions-monitoring fault with no effect on how the car drives; repair it to pass an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no noticeable change in how the car drives
- May fail an emissions or readiness test
Common causes
Most likely first
- Short-to-voltage or open in the deterioration sensor wiringLikely
- Corroded or loose connector at the sensorCommon
- Faulty direct ozone reduction catalyst deterioration sensorCommon
- Faulty ECM (least common)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the conditions.
- Inspect the deterioration sensor connector and wiring for an open or short to power.
- Check the sensor's signal and reference voltage at the connector.
- Replace the sensor if the wiring checks good.
- Clear the code and re-test; consider the ECM only as a last resort.
FAQ
Quick answers
Is it safe to drive with P2575?+
Yes. It relates to an ozone-reduction coating used for emissions monitoring, not to engine operation, so the car drives normally. Repair it mainly so the vehicle can pass an emissions test.
Can I just clear P2575?+
You can, but if the sensor or wiring is faulty it will return and readiness monitors will not complete. Fix the circuit first.
Related codes
Often seen with P2575
Read & clear P2575 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