As you turn the key in your beloved Peugeot 207, an unexpected message flashes on the dashboard – Anti Pollution Fault.

A sudden wave of worry washes over you, clouding your mind with numerous questions. What is this error all about? Is it a serious problem?

How did this happen? Rest assured, you’ve landed on the right page.

This article serves as your comprehensive guide to understanding the ‘Anti Pollution Fault’ commonly seen in Peugeot 207.

So, let’s turn the ignition on this topic and drive right into the world of automobile intricacies.

What is Peugeot 207 Anti-Pollution Fault?

What Causes Peugeot 207 Anti Pollution Fault pic

The “Anti-Pollution Fault” is an error message that can appear on the dashboard of a Peugeot 207 or similar Peugeot models. It indicates a problem or fault in the vehicle’s emission control system.

The emission control system in a car is responsible for reducing harmful pollutants and gases released into the environment.

When the system detects an issue, such as a malfunctioning sensor, a clogged catalytic converter, or a faulty exhaust component, it triggers the “Anti-Pollution Fault” warning.

The appearance of this error message is a sign that the vehicle’s engine management system has detected a deviation from the expected emissions levels.

It is a general indication that there is an emissions-related problem, but it does not specifically identify the exact cause.

What Causes Peugeot 207 Anti-Pollution Fault?

What Causes Peugeot 207 Anti Pollution Fault pic

The “Anti-Pollution Fault” in a Peugeot 207 can be caused by various factors, including

#1 Faulty Oxygen Sensor

The oxygen sensor measures the oxygen content in the exhaust gases and provides feedback to the engine management system.

If the oxygen sensor malfunctions, it can lead to an incorrect fuel-air mixture and trigger the “Anti-Pollution Fault” warning.

#2 Catalytic Converter Issues:

The catalytic converter is responsible for converting harmful gases, such as carbon monoxide and nitrogen oxides, into less harmful substances.

A damaged or clogged catalytic converter can cause the emission control system to detect irregularities and trigger the fault message.

#3 Exhaust System Leaks:

Any leaks in the exhaust system, such as cracks or loose connections, can disrupt the proper functioning of the emission control system.

Unmetered air entering the system can lead to incorrect readings and trigger the warning.

#4 EGR Valve Problems:

The Exhaust Gas Recirculation (EGR) valve helps reduce emissions by recirculating a portion of the exhaust gases back into the engine.

If the EGR valve becomes stuck or fails to function properly, it can result in increased emissions and trigger the fault message.

#5 Fuel System Issues:

Problems with the fuel injectors, fuel pump, or fuel pressure regulator can affect the fuel-air mixture and cause the emission control system to detect deviations.

This can result in the appearance of the “Anti-Pollution Fault” warning.

#6 Electrical or Sensor Malfunctions:

Faulty electrical connections, damaged wiring, or malfunctioning sensors related to the emission control system can also trigger the fault message.

These issues can disrupt communication between various components and lead to incorrect readings.

Note: The “Anti-Pollution Fault” warning is a general indication of an emissions-related problem and does not provide specific details about the exact cause.

Proper diagnosis by a qualified mechanic or Peugeot dealership using diagnostic tools is necessary to identify the specific issue and carry out the appropriate repairs.

How to Solve Peugeot 207 Anti-Pollution Fault?

To solve the Anti-Pollution Fault issue in a Peugeot 207, follow these steps:

Visit a Qualified Mechanic or Peugeot Dealership:

The first step is to have the vehicle diagnosed by a professional technician.

They will use specialized diagnostic tools to retrieve error codes from the vehicle’s computer system, which will provide specific information about the underlying issue causing the fault.

Address the Specific Cause:

Based on the diagnostic results, the technician will identify the specific cause of the “Anti-Pollution Fault” warning.

The appropriate repair procedure will depend on the exact problem. Common solutions include:

  • Repairing or replacing faulty oxygen sensors.
  • Cleaning or replacing a clogged catalytic converter.
  • Fixing any leaks in the exhaust system.
  • Repairing or replacing a malfunctioning EGR valve.
  • Addressing fuel system issues, such as replacing faulty injectors or fuel pump.
  • Fixing electrical or sensor malfunctions, including repairing wiring or replacing damaged components.

Clear the Fault Code:

After the necessary repairs have been made, the technician will clear the fault code from the vehicle’s computer system. This will reset the warning message.

Test and Verify:

The technician will perform a test drive and recheck the system to ensure that the “Anti-Pollution Fault” warning does not reappear.

They will also verify that the vehicle’s emissions are within acceptable limits.

It is essential to have the “Anti-Pollution Fault” issue addressed promptly to ensure the vehicle meets environmental standards and operates optimally.

Consulting a professional technician with expertise in Peugeot vehicles is highly recommended for accurate diagnosis and effective resolution of the problem.


In conclusion, the “Anti-Pollution Fault” in a Peugeot 207 is an indication of a problem in the vehicle’s emission control system.

It can be caused by various factors such as faulty oxygen sensors, catalytic converter issues, exhaust system leaks, EGR valve problems, fuel system issues, or electrical/sensor malfunctions.

To solve the “Anti-Pollution Fault” issue, it is recommended to consult a qualified mechanic or Peugeot dealership.

They will diagnose the specific cause by using diagnostic tools, and then address the issue accordingly.

Promptly addressing the “Anti-Pollution Fault” is crucial for environmental compliance and the proper functioning of the vehicle.

Seeking professional assistance is the best course of action to accurately diagnose and solve the problem.

Next Read: 10 Major Ways to Prevent Environmental Pollution

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