What Causes the Engine Yellow Light to Illuminate in a Focus?

[SanChase]

When sensors such as coolant temperature, crankshaft position, air flow, and intake air temperature are damaged or have poor contact, leading to signal interruption, the vehicle's ECU cannot accurately obtain engine data, which will trigger the engine fault light. It is necessary to promptly visit a repair shop for inspection. Proper driving habits and regular car maintenance in daily life can reduce the occurrence of car faults. Below are the daily maintenance and operational precautions for vehicles. Daily vehicle maintenance: Regularly change the engine oil, replace the three filters (air, oil, and fuel), and periodically top up power steering fluid, brake fluid, and coolant. Frequently check the condition of engine oil, brake fluid, and antifreeze. Additionally, keep the engine clean by washing it regularly. Driving precautions: When starting a cold engine, allow it to idle for about a minute and a half to give it time to warm up. After parking, wait an additional half minute before turning off the engine. The engine remains at a high temperature after stopping, and immediately shutting it off causes the fan to stop, which is not conducive to engine cooling.