P2575 Fault Code

Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2575 fault code indicates an issue with the Direct Ozone Reduction (DOR) Catalyst Deterioration Sensor Circuit. This sensor monitors the efficiency of the ozone reduction catalyst in the vehicle's emission control system. When the circuit is detected to be high, it suggests that there may be a malfunction within the sensor or the surrounding circuit, preventing accurate monitoring of the catalyst's performance.

What are the symptoms of the P2575 code?

Symptoms associated with the P2575 code may include:

• Check Engine Light illuminating on the dashboard
• Decreased fuel efficiency
• Increased emissions during vehicle testing
• Noticeable changes in vehicle performance, such as rough idling or stalling
• In some cases, the vehicle may not pass an emissions test.

What causes the P2575 code?

Several factors can lead to a high reading from the DOR Catalyst Deterioration Sensor, including:

• Faulty DOR catalyst sensor
• Damaged wiring or connectors in the sensor circuit
• Issues within the ozone reduction catalyst itself
• Short circuits or open circuits in the electrical pathway
• Malfunctioning engine control module (ECM) that misinterprets sensor data.

How to fix P2575?

To resolve the P2575 fault code, consider the following steps:

• Inspect the DOR catalyst sensor for physical damage or disconnection.
• Check the wiring and connectors for signs of wear, corrosion, or short circuits.
• Test the DOR catalyst itself to ensure it is functioning correctly.
• Clear the fault code and run the vehicle to see if the code returns.
• If issues persist, consider reprogramming or replacing the ECM after confirming that it is at fault.