1. Faulty Oxygen Sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas to ensure efficient fuel combustion. A faulty oxygen sensor can lead to incorrect fuel-to-air ratios and trigger the antipollution fault light.
2. Catalytic Converter Issues: The catalytic converter helps convert harmful pollutants in the exhaust gas into less harmful substances. A clogged or damaged catalytic converter can cause the antipollution fault light to illuminate.
3. Exhaust Gas Recirculation (EGR) System Malfunction: The EGR system recirculates a portion of the exhaust gas back into the engine to reduce emissions. If the EGR valve is faulty or clogged, it can cause the antipollution fault light to appear.
4. Diesel Particulate Filter (DPF) Issues (Diesel Engines Only): Diesel vehicles are equipped with a DPF to capture and remove soot particles from the exhaust. A blocked or malfunctioning DPF can lead to the antipollution fault light being activated.
5. Faulty Mass Airflow Sensor (MAF): The MAF sensor measures the amount of air entering the engine. If the MAF sensor is faulty, it can provide incorrect data, affecting the fuel-to-air mixture and potentially causing the antipollution fault light to illuminate.
6. Fuel Injector Problems: Faulty or clogged fuel injectors can cause the engine to run inefficiently, resulting in higher emissions and the activation of the antipollution fault light.
It's important to note that the exact cause of the antipollution fault light in your Peugeot 207 can vary, and it's recommended to have the vehicle diagnosed using appropriate diagnostic equipment by a qualified mechanic or at an authorized service center.
