P2568 - Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance
The P2568 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the Direct Ozone Reduction (DOR) catalyst temperature sensor circuit. This sensor monitors the temperature of the DOR catalyst, which is part of the emissions system designed to reduce ozone-forming pollutants. The ECM compares the sensor's readings to expected values; if the signal is out of range or the sensor response is slow, it sets this code. Common causes include a faulty sensor, wiring issues, or exhaust leaks affecting temperature readings.
01. Most Common Causes
- Faulty DOR catalyst temperature sensor
- Open or shorted wiring in sensor circuit
- Exhaust leaks near the sensor
- Failed DOR catalyst
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Increased emissions
- Possible failed emissions test
- Reduced fuel economy (in some cases)
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the DOR temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output with a multimeter and compare to manufacturer specifications.
Step 4: Check for exhaust leaks upstream of the sensor that could affect temperature readings.
Step 5: If sensor and wiring are okay, test the DOR catalyst function and ECM communication.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the vehicle may fail an emissions test and could experience reduced fuel economy. Prolonged driving with a faulty sensor may lead to catalyst damage.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor adds $100-$250 depending on the vehicle.