The exhaust emission warning lamp in a VW Polo indicates that there is a problem with the vehicle's exhaust system. This could be due to a number of factors, including:
* A faulty oxygen sensor. The oxygen sensor measures the amount of oxygen in the exhaust gas. If the oxygen sensor is faulty, the engine will not be able to properly adjust the fuel mixture, which can lead to increased emissions.
* A faulty catalytic converter. The catalytic converter helps to convert harmful pollutants in the exhaust gas into less harmful substances. If the catalytic converter is faulty, it will not be able to do its job effectively, which can lead to increased emissions.
* A faulty exhaust gas recirculation (EGR) valve. The EGR valve helps to reduce nitrogen oxide (NOx) emissions by recirculating a small amount of exhaust gas back into the engine. If the EGR valve is faulty, it will not be able to do its job effectively, which can lead to increased NOx emissions.
If the exhaust emission warning lamp is illuminated, it is important to have the vehicle checked by a qualified mechanic as soon as possible. Driving with a faulty exhaust system can damage the engine and other components of the vehicle, and it can also lead to increased emissions.
Here are some additional things to keep in mind if the exhaust emission warning lamp is illuminated:
* The vehicle may still be drivable, but it is important to have it checked by a mechanic as soon as possible.
* Driving with a faulty exhaust system can damage the engine and other components of the vehicle, and it can also lead to increased emissions.
* The cost of repairing a faulty exhaust system will vary depending on the problem.
