Toyota Motor Sales will replace an oil hose in about 933,800 vehicles in the United States because of the risk of a leak that could damage, the automaker confirmed to Reuters on Monday.

It was the latest blow to its quality image, which is suffering from ongoing recalls, safety investigations on more than 10 million vehicles globally.

Toyota’s quality control head,  Shinichi Sasaki, and North American President Yoshimi Inaba are scheduled to appear before a Senate committee on tomorrow  for a third hearing on its and  the National Highway Traffic Safety Administration’s handling of complaints and 34 alleged deaths involving sudden or uncontrolled  acceleration.

In the defective oil hose case, Camry, Avalon, Rav4 and Lexus vehicles with V6 engines are affected. An engine oil hose may leak Toyota said in a bulletin sent to U.S. dealers and obtained by Reuters on Monday.

Toyota says t has taken this step in the interest of customer satisfaction –  informing owners that Toyota and Lexus dealers will modify their vehicle prior to them experiencing the condition.

This is actually the expansion of  two previous service actions. For phase three revealed today, there are approximately 128,800 Avalon (2007 – 2009 model year) and 89,000 RAV4 V6 (2007 – 2009 model year) vehicles involved in the United States.

Last year, Toyota also announced phases one and two of this service action  on approximately 342,200 Toyota Avalon (model year 2005 – 2006), Camry (2007 – early 2010) and RAV4 V6 (2006 model year), and 374,000 Lexus ES 350 (model year 2007-2008) and RX 350 (model year 2007-2009) vehicles.

Owners of the involved vehicles will receive a notification by first class mail.

Toyota dealers will replace the VVT-i oil hose with a newly designed one at no  charge  to the customer. The repair will take approximately one hour. However, Toyota says depending upon the dealer’s work schedule, it may be necessary to make the vehicle available for a longer period of time.

This Limited Service Campaign will be offered until March 31, 2013.

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