P2568: Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance
What to do
Nothing will be noticeable in how the car drives — this system does not affect the engine. It matters for emissions testing, because the monitor cannot complete while the reading is untrustworthy.
The sensor lives at the front of the car in the path of road spray, salt and stones, so corrosion or physical damage to it and its wiring is common and is worth looking at before the part is condemned.
What this code means
The ozone catalyst temperature reading is electrically valid and implausible — not tracking ambient temperature at rest, not rising as it should with airflow and engine heat, or sitting at one value regardless of conditions. What the catalyst is and why its temperature is monitored is at P2567.
A reading stuck at a plausible-looking value is the characteristic failure here, and it is invisible without comparing the sensor against the ambient air temperature sensor after the vehicle has stood overnight. Two sensors measuring air that has had all night to reach the same temperature should agree; if they do not, one of them is wrong, and this is the cheaper of the two to be suspicious of.
The sensor sits at the front of the vehicle, directly in the path of road spray, salt and stone chips, so physical damage and corrosion are ordinary findings rather than unusual ones.
Likely causes
Start here
Less common
- Physical damage from road debris · moderate
- Damaged wiring harness · moderate
- Debris or damage to the radiator coating · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
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