Court documents filed Monday allege that five auto companies were aware of defects that caused Takata airbags to potentially harm or kill motorists, but continued to use them in order to save on costs. The documents filed by lawyers representing victims and their families claim that Honda, Ford, BMW, Toyota and Nissan have known about the issues with the Japanese manufacturer’s airbags for more than a decade but used the airbags anyway because Takata was cheaper than its competitors and could produce the bulk quantities the automakers needed, according to the court documents. The allegations come as Takata entered a guilty plea in a federal courtroom Monday as part of its agreement with the Department of Justice.