Toyota Motor Corp. has moved to strike evidence from a software expert who claims to have identified a bug in the electronic throttle control system source code that plaintiffs attorneys blame for unintended acceleration by Toyota vehicles.

Michael Barr, who specializes in embedded software programming, was deposed on July 3 in as a plaintiffs expert in the first bellwether trial of hundreds of cases pending in federal court in Santa Ana, Calif. The case, scheduled to go to trial on November 5, was brought by the estate of Ida St. John, 83, who suffered back injuries after her 2005 Camry accelerated while at a stop sign.