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Why do a car smell like rotten egg when its only on?

The rotten egg smell you are experiencing from your car when it's only on could be due to several reasons:

1. Catalytic Converter Failure: The catalytic converter is a vital component of your vehicle's exhaust system that helps convert harmful pollutants into less toxic substances. When the catalytic converter fails or becomes damaged, it can emit a rotten egg-like odor.

2. Sulfur in Fuel: Gasoline contains sulfur, which, when burned, produces sulfur dioxide. In some cases, the sulfur content in the fuel can be higher than usual, resulting in a strong rotten egg smell.

3. Transmission Fluid Leak: Transmission fluid contains chemicals that, when overheated or leaked, can produce an unpleasant odor similar to rotten eggs.

4. Coolant Leak: A coolant leak can also cause a rotten egg smell when the coolant comes into contact with hot engine parts.

5. Electrical Issues: Faulty electrical components, such as wiring problems or a bad ignition coil, can generate a sulfurous odor.

6. Blocked or Restricted Exhaust: If your car's exhaust system is blocked or restricted, it can cause a buildup of exhaust gases, leading to the emission of a rotten egg smell.

If you notice a rotten egg smell coming from your car, it is important to take your vehicle to a qualified mechanic for inspection and repair to ensure that the underlying issue is properly diagnosed and addressed to avoid any potential safety hazards or further damage to your vehicle.