Some older Ford cars and SUVs pose "unreasonable" ​safety risks, according to federal regulators, warning that the timing belt may fail, causing them to lose ‌power or engines to seize. The National Highway Traffic Safety Administration announced on Monday that it has upgraded a defect investigation into 135,551 Ford vehicles from model years between 2014 and 2021 that are powered by the small 1.0L turbocharged three-cylinder engine due to an "unreasonable risk to motor vehicle safety." The probe suggests failures can happen without sufficient warning and loss of power or engine seizure is imminent. Some drivers reported engine failures that cost thousands of dollars to fix. Data showed an average failure mileage of roughly ​70,000 miles, and 98% of the failures happened before ​the 150,000-mile suggested ⁠timing belt replacement, the NHTSA said.