The National Highway Traffic Safety Administration (NHTSA) has concluded a preliminary investigation into thousands of Tesla units.

The investigation focused on the suspension failures of 74,918 Tesla vehicles, Reuters reported Wednesday. In 2020, the Office of Defects Investigation initiated a probe into the suspension flaw, which was brought up by complaints alleging faults particularly in the front suspension fore links.

The vehicles involved at that time were the Tesla Model S, released from 2015 to 2017, and the Model X vehicles produced from 2016 to 2017. The fore link is a fundamental component inside a vehicle's suspension, and if defective, it could cause more damage to other sections.

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The ODI shared that the investigation has wrapped up since no instances were found to support the claim that the part's failure hindered the vehicles' control.

Tesla was requested for a comment about the investigation's closing, but the automaker has not responded. Although the investigation has ended, the NHTSA shared that safety and other issues are still inevitable.

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Since 2018, Tesla has initiated a total of nine recalls in the United States, as it involves mostly concerns about steering and suspension components.

According to NHTSA, Tesla also said that a consumer satisfaction bulletin was issued in 2017 to replace vehicle components produced between January and May 2016. However, it doesn't cover 75% of failure occurrences mentioned by the investigation.

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In December, Reuters reported that Tesla documents cited thousands of owners had encountered premature suspension failures and issues on steering parts since 2016.

The files showed that Tesla had blamed drivers for the frequent suspension failures and steering problems. A regulator also shared that the majority of the fore link failures happened at a speed of one to 15 mph while parking.

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