For the past two weeks my car has had a bad smell, and I cannot ignore it anymore. It is like rotten eggs, and it is strongest when I stop at a signal after a long drive. I have a 2014 Infiniti QX50 with about 98,000 km. The smell is not there every day, but when it comes, my wife covers her nose and tells me to open the window. I also feel the car is a little weak when I go up a bridge or a slope. Before, it was smooth, and now I need to press the pedal more. Last month the engine light came on for two days and then went off by itself, so I thought it was nothing. My friend says it is because of bad petrol, so I should change the petrol station. My brother says the smell comes from the exhaust and that it can be a serious thing. I did not know which one to believe, so I searched a lot at night. I found a page on infinitiservicemussafah.ae that explained the exhaust part that cleans the smoke from the engine. It said when this part gets blocked or tired, the smell can become strong and the car can lose power. That sounded very close to my case. After that I started looking for Leading catalytic converter repair for Infiniti in Musaffah Industrial Area , because my office is near there and I can go after work. I have some easy questions for you all. Did your car smell like this before the problem was found? Is the bad petrol idea really possible, or is it just a story? Can I drive for a few more days, or can it hurt the engine? Also, is the repair costly, and does it take the full day? I only want honest answers from people who faced the same thing. Thank you for reading.