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Engine Fault Code P2571

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

Care Engine Code Reader
The engine fault code P2571 refers to a problem with the Direct Ozone Reduction Catalyst Temperature Sensor Circuit. This code indicates that the temperature sensor, which is responsible for monitoring the temperature of the catalyst, is experiencing intermittent or erratic signals. This can lead to issues with the vehicle`s emissions system and overall performance.

Possible Causes:

1. Faulty Temperature Sensor: The sensor itself may be damaged or malfunctioning.
2. Wiring Issues: Damaged or corroded wiring and connectors can cause erratic readings.
3. ECU Problems: The Engine Control Unit (ECU) may have issues interpreting the sensor data.
4. Catalytic Converter Issues: Problems with the catalytic converter can affect the sensor readings.

Manufacturer-Specific Meanings:
While P2571 generally has the same meaning across different manufacturers, the context and specific components involved may vary. Here are some possible alternative interpretations for certain brands:

Porsche: Similar to the general meaning, but could be linked to specific emissions regulations for certain models.
Mini: May relate to issues with the vehicle`s smaller engine configurations and how they manage emissions.
Mercedes: Often tied to more advanced emissions systems, possibly indicating a need for software updates.
Audi: Similar to Volkswagen, may involve unique components in their emissions systems.
Jaguar: May indicate a need for specific diagnostic tools to read the sensor data accurately.
Land Rover: Could be associated with off-road performance and how the emissions system behaves under different conditions.

What to Do:
If you see this code, its best to have a qualified mechanic check the vehicle. They can diagnose the issue, inspect the wiring and sensors, and ensure everything is functioning correctly. Ignoring this code can lead to increased emissions and potential damage to the catalytic converter.
The Engine Fault Code P2571 indicates a problem with the Direct Ozone Reduction Catalyst Temperature Sensor Circuit. This code can show up in various vehicles, including European brands like Porsche, Mini, Mercedes, Audi, Jaguar, and Land Rover. Here are some common causes for this code:

1. Faulty Temperature Sensor: The most common reason for this code is a malfunctioning temperature sensor itself. If the sensor is damaged or worn out, it may send incorrect readings to the engine control unit (ECU).

2. Wiring Issues: Damaged or corroded wiring and connectors in the sensor circuit can lead to intermittent or erratic signals. This can happen due to exposure to heat, moisture, or physical wear.

3. ECU Problems: In some cases, the engine control unit may have a fault that affects how it interprets signals from the temperature sensor. This is less common but still a possibility.

4. Exhaust System Issues: Problems in the exhaust system, like leaks or blockages, can affect the temperature readings. If the exhaust isn`t flowing correctly, it could lead to erratic sensor behavior.

5. Calibration Issues: Sometimes, the sensor may need to be recalibrated, especially after repairs or replacements in the exhaust system.

6. Intermittent Faults: The code can also appear due to intermittent faults, where the sensor works fine at times but fails under certain conditions, like temperature changes or vibrations.

Manufacturer-Specific Notes:

Porsche: Look for issues with the high-performance exhaust systems, as they can affect temperature readings.

Mini: Wiring harness issues are common due to the compact design of Mini vehicles, so check for chafing or wear.

Mercedes: Mercedes models may have more complex ECU systems, so ensure that software updates are applied.

Audi: Audi vehicles often have multiple sensors; ensure you are checking the correct one for the P2571 code.

Jaguar: Jaguar vehicles might have unique sensor designs, so using OEM parts for replacements is crucial.

Land Rover: Given the off-road capabilities, check for dirt or moisture in the wiring connections, which can cause erratic signals.

If you encounter this code, it`s best to start with a thorough inspection of the sensor and its wiring, followed by checking the ECU and exhaust system. Always refer to the specific vehicle`s service manual for detailed troubleshooting steps.
The P2571 code indicates a problem with the Direct Ozone Reduction Catalyst Temperature Sensor Circuit. This sensor helps monitor the temperature of the catalyst, which is crucial for reducing emissions. Heres how you can troubleshoot and potentially fix this issue, keeping in mind that the approach may vary slightly depending on the manufacturer or specific vehicle model.

General Steps to Fix P2571:

1. Check for Other Codes: Use an OBD-II scanner to check if there are any other fault codes. Sometimes, fixing one issue can resolve others.

2. Inspect Wiring and Connectors:
– Look for damaged wires, loose connections, or corrosion around the temperature sensor and its connectors.
– Repair or replace any damaged wiring or connectors.

3. Test the Temperature Sensor:
– Using a multimeter, check the resistance of the temperature sensor. Refer to the vehicles service manual for the correct resistance values at various temperatures.
– If the sensor is out of spec, replace it.

4. Check for Exhaust Leaks:
– Inspect the exhaust system for leaks near the catalyst. Exhaust leaks can cause erratic readings from the temperature sensor.

5. Inspect the Catalyst:
– If the catalyst is clogged or damaged, it can affect the temperature readings. You may need to replace the catalyst if its faulty.

6. Clear Codes and Test Drive:
– After making repairs, clear the codes with the scanner and take the vehicle for a test drive to see if the code returns.

Manufacturer-Specific Considerations:

Porsche: Check for specific service bulletins related to the exhaust system or emissions components. Porsche models may have unique wiring harness layouts.

Mini: Mini vehicles often have compact engine bays, making access to the sensor and wiring a bit tricky. Ensure you have the right tools to reach the sensor.

Mercedes: Mercedes may have advanced diagnostic tools that can provide more detailed information about the fault. If available, use them for a deeper analysis.

Audi: Audi models might have specific recalls or service campaigns related to emissions. Check with a dealer for any updates that may apply.

Jaguar: Jaguar vehicles may have integrated systems that require specialized software for diagnostics. If youre unsure, consulting a professional may be best.

Land Rover: Land Rover vehicles often have complex electrical systems. If the issue persists after checking the sensor and wiring, consider having a professional perform a thorough diagnostic.



Fixing the P2571 code involves a systematic approach to checking the temperature sensor, wiring, and related components. Depending on the make and model, there may be specific quirks or additional steps required. If youre not comfortable with any of these steps, its a good idea to consult a professional mechanic, especially for European cars, as they can have unique systems that require expert knowledge.
Driving with a P2571 code, which indicates an issue with the Direct Ozone Reduction Catalyst Temperature Sensor Circuit, can vary in safety depending on the vehicle and its specific systems. Heres a breakdown based on different manufacturers:

General Considerations:
– Immediate Risks: In most cases, its not an immediate safety risk. However, it could affect emissions performance and fuel efficiency.
– Check Engine Light: If the check engine light is on, its a good idea to address the issue soon to avoid further complications.

Manufacturer-Specific Insights:

1. Porsche:
– Impact: Driving with this code may lead to reduced engine performance and increased emissions.
– Its advisable to get it checked soon to prevent potential damage to the catalytic converter.

2. Mini:
– Impact: Similar to Porsche, it could affect emissions and performance.
– Monitor for any unusual performance issues and have it diagnosed.

3. Mercedes-Benz:
– Impact: The vehicle may enter limp mode, limiting power to protect the engine.
– Its best to have it inspected quickly to avoid further issues.

4. Audi:
– Impact: May lead to reduced engine efficiency and could trigger more codes.
– Address the issue promptly to maintain performance.

5. Jaguar:
– Impact: Could affect engine performance and emissions systems.
– Its wise to get a professional opinion to avoid complications.

6. Land Rover:
– Impact: Similar issues with performance and emissions can occur.
– Get it checked to ensure no further damage occurs.


While it may not be immediately dangerous to drive with a P2571 code, it is best to address the issue as soon as possible. Each manufacturer has its own quirks, so always consider getting a professional diagnosis to prevent potential problems down the road.

OBD Codes Explained

Engine Codes

P is for PowerTrain - Engine and Transmission.

P0 Indicates Generic Powertrain Codes

P0 Codes indicate problems with the powertrain and are common for all vehicles using the OBD-II Standard.

P1 Enhanced Manufacturer Specific Codes

P1 Codes are specific to manufacturers.

Sub-System

The 3rd Digit indicates the Sub-System

1 – Emission Management

2 – Injector Circuit

3 – Ignition

4 – Emission Control

5 – Vehicle Speed and Idle

6 – Computer and Output

7 – Transmission

8 – Transmission

9 – Reserved

0 – Reserved

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