What is the reason for the 'Engine Malfunction, Service Required Immediately' warning in a Focus?
2 Answers
If a Focus displays the 'Engine Malfunction, Service Required Immediately' warning, it could be due to poor fuel quality, engine issues, carbon buildup in the engine, or problems with the oxygen sensor. Below are the potential causes: 1. Use of substandard fuel: If a Focus frequently uses low-quality fuel, it can easily lead to incomplete combustion, causing the fuel filter screen to clog. Prolonged use of such fuel can also damage the spark plugs, catalytic converter, and oxygen sensor. 2. Low-speed driving and extended operation: If the Focus often drives at low speeds in urban areas, it can easily lead to carbon buildup in the throttle or inside the engine. When the vehicle is driven for long periods, the insulation of the high-tension wires may age and become prone to breakdown, also triggering the 'Engine Malfunction, Service Required Immediately' warning.
I remember last summer when I was driving, the engine malfunction warning in my Ford Focus suddenly lit up, which gave me quite a scare! It turned out to be a refrigerant leak in the air conditioning system, directly causing the engine overheating alarm. Similar issues could also be caused by a cooling system leak, a damaged fan, or a stuck thermostat. If left unchecked, it could easily lead to engine failure. That time, I had to tow it to the repair shop and spent several thousand replacing parts. My advice is to stop the car as soon as you notice the warning, check if the temperature gauge is abnormal, and it's best to turn off the AC and drive at a reduced speed. Regularly checking the coolant can prevent such incidents—safety first, after all.
