Toyota’s top US executive has acknowledged he’s unsure if his company has addressed the mechanical problems that led to the recall of millions of vehicles. Speaking before the House Energy and Commerce Committee, Jim Lentz said he can’t guarantee the recall will completely address issues with unintended acceleration found in Toyota cars. Lentz also publicly apologized to Toyota customers.

Jim Lentz: “In recent months we have not lived up to our high standards our customers and the public have come to expect from Toyota. Put simply, it’s taken us too long to come to grips with a rare but serious set of safety issues despite all of our good faith efforts. The problem has also been compounded by our poor communications within our company and with regulators and consumers.”

The hearing also heard from Toyota owner Rhonda Smith, whose car once sped up to 100 miles an hour even though she had applied the emergency brake. Smith criticized both Toyota and federal regulators.

Rhonda Smith: “And today I must say, shame on you, Toyota, for being so greedy, and shame on you, NHTSA, for not doing your job.”

Toyota President Akio Toyoda is scheduled to testify at a House Oversight and Government Reform Committee later today.