None — Tim Maddock almost died.
His 29-year-old girlfriend, Chasity Glisson, lost her life after investigators said she left her Lexus running in the garage of her Florida townhome.
Maddock said he never heard the car running.
"I went up and down the stairs twice," he said. "I never heard it."
According to investigators, the carbon monoxide level in the bedrooms above the garage were one and a half times higher than what is considered dangerous.
Maddock was hospitalized in intensive care for nearly a week. He blames the ignition system in Glisson's Lexus where an on/off button is used instead of a key. The feature is a recent addition to more than 150 models of newer cars.
It offers convenience, but critics said the lack of an automatic shutdown means an easy mistake can quickly turn deadly.
"If the car had an on/off switch, she's be here today," Maddock said.
The National Highway Safety Administration has had 10 complaints about risky ignitions.
Attorney John Uustal, who is representing Maddock, filed a complaint against Toyota. He argued the keyless ignition system operates in a way that most people do not expect.
"There is no doubt this is going to happen again," Uustal said.
In response, Toyota said the key system fully complied with federal standards and noted there are layers of visual and audio warnings to alert occupants when the engine is still running.
Maddock said that kind of warning is not enough. "Make it shut off," he said.