NHTSA Closes Investigation Into 240,000 Diesel Volkswagen, Audi Vehicles

Apr 02, 2015 08:09 AM EDT | Matt Mercuro

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The National Highway Traffic Safety Administrations will close a nearly 5-year-old probe into 241,000 diesel powered Volkswagen vehicles without calling for a company recall.

The safety agency will close its investigation into 2009-12 Jetta, Golf, Touareg, Audi A3 and Q7 TDI clean diesel models, which is good news for owners.

Over 800 different complaints were made about high-pressure fuel pump failures that causes contamination of the fuel system, according to a NHTSA probe summary.

"Volkswagen believes that misfueling with gasoline is the primary cause of HPFP drivetrain failures in the field," NHTSA said regarding the probe. "Only the Q7 vehicles were built with misfuel protection devices."

In 2013, VW agreed to install devices to prevent owners from misfueling their diesel vehicles.

No reports of crashes, injuries or fatalities have been linked to the alleged defect yet. The probe was opened back on Feb. 7, 2011.

"Analysis of the HPFP drivetrain failure incidents indicates that most failures do not result in engine stall while driving and, when pump drivetrain failure does result in stall while driving, it is usually preceded by numerous warning symptoms," said NHTSA in its summary.

The probe closed without any recalls, which is good news overall for owners but it does not mean that a safety-related defect doesn't exist.

The NHTSA did open a new investigation into 30,000 2012 VW Passat and CC vehicles after receiving nine reports from owners complaining about electronic defects, according to The Detroit News. Defects include loss of connectivity of the steering wheel electrical devices, which could affect the performance of steering wheel mounted components.

Visit SafeCar to see if your car is affected by the probe.

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