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The warning "engine coolant low service required" on the Ford Fusion is straightforward—it indicates that the coolant level is low and needs to be replenished or replaced. Sometimes, even after changing the coolant, this message may still appear. To resolve this, try filling the coolant up to the maximum level precisely. If the message persists after the coolant has been refreshed, the problem could be related to a faulty sensor, wiring issue, or software problem. In the case of a sensor or wiring problem, they would require replacement, or if it's a software issue, it would need to be addressed. The vehicle has a coolant capacity of 7.8 quarts for the initial fill when the coolant level is actually low.
Some Ford Fusion drivers have reported receiving a low engine coolant service notification despite confirming that their coolant level is fine.