If you have noticed that the engine management warning light has switched on your dashboard, it is most likely a problem with one of the sensors. This is the most common cause on the VW Lupo. This is due to a faulty Lambda sensor. This part is responsible for helping control exhaust emissions. The solution is to replace the Lambda sensor to resolve the issue. That is also why it is important to check your led interior car lights once in a while. It may cause more trouble than one can think at first. I am sorry this happened to you, but I hope it serves as a lesson for the others.