P2570
Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
Exhaust / emissions
Generic OBD-II
Low
What it means
P2570 means the temperature sensor for the direct-ozone-reduction catalyst is reading abnormally high (or open). This catalyst coating helps break down ground-level ozone, and the sensor lets the ECU monitor it. The fault is electrical — a sensor or wiring problem — and doesn't affect how the engine starts or runs.
Low
Can I keep driving? Safe to drive — this is an emissions-monitoring sensor circuit. Expect little or no change in how the vehicle runs, but the check-engine light will stay on.
Common symptoms
What you'll notice
- Check-engine light on
- No noticeable change in how the vehicle drives
- May fail an emissions test until repaired
Common causes
Most likely first
- Faulty direct-ozone-reduction catalyst temperature sensorLikely
- Open or short-to-voltage in the sensor signal wiringCommon
- Corroded or loose sensor connectorCommon
- High resistance from heat-damaged wiring near the exhaustLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and check the live temperature-sensor value for a stuck-high or open reading.
- Inspect the sensor connector and harness for corrosion, heat damage, or a loose pin.
- Measure the signal and ground circuits for an open or short to voltage.
- Compare the sensor resistance to spec and replace it if out of range.
- Clear the code and confirm a normal reading after a drive.
FAQ
Quick answers
Is it safe to drive with P2570?+
Yes. It's an emissions-catalyst temperature sensor circuit fault, so the engine runs normally. The main downside is the warning light and a possible emissions-test failure.
Can I just clear P2570?+
It returns while the sensor or wiring is faulty. Clearing it only helps confirm whether the fault is still active.
Related codes
Often seen with P2570
Read & clear P2570 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