The National Highway Traffic Safety Administration's Office of Defects Investigation closed a four-year probe into suspension failures affecting some Teslas, known as the 'whompy wheel' problem.
NHTSA found hundreds of incidents of front suspension failures affecting Model S sedans and Model X SUVs. Their findings indicated that many more vehicles were fitted with bad parts.
Tesla faced scrutiny for their response to reported suspension issues, attributing many failures to 'driver abuse' despite evidence of design flaws causing the problems.
NHTSA identified 426 reports of suspension failures during its investigation and encouraged Tesla to expand their service bulletin on faulty components.
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