P2568
Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance
Auxiliary emissions control
Generic OBD-II
Low
What it means
P2568 means the temperature sensor for the direct ozone reduction catalyst is reading a value the computer considers implausible. This catalyst-monitoring sensor is part of the emissions system, so the fault typically comes from a drifting sensor, a bad connector, or damaged wiring. It affects emissions monitoring, not how the engine drives.
Low
Can I keep driving? Safe to drive. The engine runs and starts normally; this is an emissions-monitoring fault, not an engine performance problem.
Common symptoms
What you'll notice
- Check-engine light on
- Temperature reading out of its expected range
- Emissions monitor not completing (may fail an emissions test)
- No change in idle, power, or starting
Common causes
Most likely first
- Failing or drifting direct ozone reduction catalyst temperature sensorLikely
- Corroded or high-resistance connector skewing the signalCommon
- Wiring damage or poor ground shifting the reading out of rangeCommon
- Sensor contamination affecting its responseLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check the sensor's live temperature against ambient at cold start.
- Compare the reading with expected values; a stuck or drifting sensor reads implausibly.
- Inspect the connector and wiring for corrosion, damage, or a poor ground.
- Verify the reference and ground at the sensor connector.
- Replace the sensor if it stays out of range with good wiring, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2568?+
Yes. It's an emissions-monitoring code and doesn't affect how the engine runs. It may, however, cause an emissions-test failure.
Can I just clear P2568?+
It returns once the monitor sees the out-of-range reading again. Repair the sensor or wiring first.
Related codes
Often seen with P2568
Read & clear P2568 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