If you’re a Peugeot 207 owner, you may have encountered the dreaded “depollution system faulty” warning on your dashboard. This issue can be frustrating and confusing, as it doesn’t always point to a specific problem with the car. However, fear not! I’m here to guide you through the process of diagnosing and fixing this common problem.
Understanding the Depollution System
The depollution system is a crucial part of modern cars and helps reduce harmful emissions by treating exhaust gases before they are released into the atmosphere. In a Peugeot 207, this system consists of various components that work together to achieve optimal fuel combustion and lower emission levels. Some key parts of this system include:
- Catalytic converter
- Exhaust gas recirculation (EGR) valve
- Fuel injectors
- Oxygen sensors
- Evaporative emissions control system
- Particulate filter (only present in diesel models)
If any part of this system malfunctions or becomes damaged, it can lead to the “depollution system faulty” warning appearing on your dashboard.
Diagnosing the Problem
Before delving into potential fixes for the depollution system fault, it’s essential to properly diagnose the cause of the problem in your specific vehicle. Here are some general steps you can follow:
- Observe any additional symptoms – Does your car exhibit poor fuel efficiency, decreased performance, or difficulty starting? These signs could help narrow down the issue.
- Use an OBD-II scanner – A diagnostic tool can help you read fault codes stored in your car’s onboard computer. These codes can point you to the specific component that’s causing the warning message to appear.
- Perform a visual inspection – Inspect all visible components for damage, blockages, or leaks; this includes hoses, fuel lines, and electrical connections.
- If necessary, consult a professional mechanic for further diagnosis and repair.
Common Causes of Depollution System Faults
Now that we have a better understanding of what the depollution system is and how to diagnose potential issues let’s explore some common causes of these faults.
Faulty Exhaust Gas Recirculation (EGR) Valve
A damaged or clogged EGR valve can cause poor exhaust emission control and trigger the depollution system fault warning. To fix this issue:
- Locate the EGR valve on your car. This valve is typically located near the intake manifold and connected by hoses and wires.
- Carefully remove the valve from its position, taking note of any wiring or hose connections.
- Clean the valve with a carburetor cleaner, ensuring all carbon build-up and debris are removed.
- Inspect the valve for damage. If any damage is detected, replace the valve.
- Reinstall the EGR valve, reconnecting all hoses and wiring.
Damaged Oxygen Sensors
Bad oxygen sensors can result in incorrect air-fuel mixture readings for your engine, leading to the depollution system fault notification. To address this issue:
- Identify the location of your oxygen sensors in your vehicle’s exhaust system; there should be both an upstream and downstream sensor.
- Using an O2 sensor removal tool, carefully remove each sensor, making note of any wiring connections.
- Inspect the sensors for damage or signs of wear; if damaged, replace them with compatible replacements.
- Clean the sensors with a mass air flow sensor cleaner, then reinstall them into their positions within the exhaust system.
Clogged Fuel Injectors or Fuel Pump Issues
Fuel delivery issues can also lead to depollution system faults if they cause improper fuel combustion. Common culprits include clogged fuel injectors, contaminated fuel, and faulty fuel pumps.
- To clean fuel injectors, you can add a fuel injector cleaner to your fuel tank during your next fill-up, following the product instructions closely. This treatment will help remove debris and buildup that can cause improper fuel delivery.
- If you suspect a problem with your fuel pump, it’s best to consult a professional mechanic who can test and repair the pump as needed.
Malfunctioning Evaporative Emissions System
Issues with the evaporative emissions control system can trigger the depollution system fault message on your dashboard. Some potential issues include:
- A loose or damaged gas cap – Make sure the cap is tightly secured and free from cracks
- Blocked or cracked charcoal canister – Inspect the canister and its vent lines/hoses for any visible damage
- Faulty purge valve or vent solenoid – Consult your vehicle’s service manual for replacement instructions
Maintaining a Healthy Depollution System
Regular maintenance is key to preventing depollution system faults in the future. Follow these tips to ensure your Peugeot 207 stays emission-friendly:
- Schedule regular tune-ups and oil changes to maintain optimal engine performance.
- Use high-quality fuels to minimize contaminants that can damage components.
- Periodically inspect visible parts of the depollution system for wear, leaks, or damage.
Although encountering a “depollution system faulty” warning can be stressful, armed with knowledge of common causes and fixes, you’ll be well-equipped to address this issue in your Peugeot 207. Remember to diagnose the issue properly before attempting any repairs, and consult a professional mechanic if in doubt. Following these steps will have your car back on the road in no time!
About the author
Marcus Brown is editor-in-chief of The FatMech and is a mechanic with ten years' experience based in London, UK. Having worked for major dealerships for many years, Marcus now works for a local independent garage and has experience working on nearly every make and model of car. Marcus also has a passion for writing and teaching, which is where the idea for The FatMech came from. In his spare time, Marcus enjoys playing golf, doing home renovations and gardening. He lives just outside London with his wife and son.