DETROIT, Michigan - Toyota's problems with runaway acceleration just won't go away as the company recently announced plans to expand its vehicle recall for unintended acceleration to include 154 000 Lexus SUVS. Toyota SA has, however, said it is “… not part of this preventative action.”The recall of 2010 Lexus RX350 and RX450h models was sought by the US National Highway Traffic Safety Administration (NHTSA). Toyota spokesman Brian Lyons said the automaker was cooperating with the NHTSA and providing information investigators asked for.CLEARED BY NASAThe latest US recall continues a series started three years ago while, in 2010 and 2011 Toyota was made to pay the US government a record $48.8 million in fines for failing to promptly alert regulators to safety problems. The latest recall is said to relate to the driver’s side floor mat that could trap the accelerator and cause the SUV to accelerate unexpectedly. The automaker's string of unintended acceleration recalls occurred in 2009 and 2010, raising suspicions about Toyota's electronic throttle controls.NHTSA brought in scientists from NASA to help investigate, finding nothing wrong with the electronics in a probe that ended early in 2011. NHTSA said at the time recalls for sticky gas pedals and floor mats would take care of unintended acceleration.