Where is the engine control unit in a 1999 Hyundai Sonata V6?

The Engine Control Unit (ECU), also sometimes called the Powertrain Control Module (PCM) in a 1999 Hyundai Sonata V6, is typically located underneath the dashboard, on the passenger side. However, accessing it might require removing some panels. It's usually secured to the firewall or a nearby support structure.

Because its exact location can vary slightly depending on trim level and options, it's best to consult a repair manual specific to your 1999 Hyundai Sonata V6. A Haynes or Chilton manual would be a good source for diagrams and detailed instructions. You can also search online for "1999 Hyundai Sonata V6 ECU location" along with images to help you visually identify it.