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To locate the ECU in a 2003 Ford Focus, you can refer to this video tutorial on YouTube: https://www.Youtube.com/watch?v=2L1NHH4SW44. Be aware of potential engine issues such as loose gaskets, oil leaks, and spark plug malfunctions, all of which should be addressed promptly. It is crucial to prevent the engine from overheating, as this could lead to serious consequences like car fires and explosions. Keep an eye on oil consumption and ensure timely changes when needed. Remember to replace the air filter every 15,000 to 30,000 miles, change the coolant every 60,000 miles, and swap out spark plugs every 100,000 miles unless using copper ones, which should be replaced more frequently at around 30,000 miles.
The electronic control unit (ECU) of a 2003 Ford Focus can be found beneath the dashboard on the right side for the passenger.