Lexus IS250 persistent gas and exhaust smell in cabin unresolved for years on Lexus IS250

Some Lexus IS250 owners report experiencing a persistent gas and exhaust smell in the cabin, which could indicate serious issues such as a gasoline leak, posing a significant fire hazard. This smell may arise from hidden fuel leaks in the engine bay or undercarriage that do not always produce visible signs on the ground. Additionally, some owners note that exhaust system problems, like a failing catalytic converter or exhaust leak, can lead to unpleasant odors entering the cabin, particularly during hard acceleration. Furthermore, a sulfur or rotten egg smell may occur when driving at high speeds, often linked to a rich fuel mixture caused by a defective oxygen sensor, leaking fuel injector, or faulty pressure regulator. To address these concerns, it is advised that owners have their vehicles inspected by a qualified mechanic to identify and repair any leaks or exhaust issues promptly, ensuring regular maintenance to prevent further odors.