NHTSA upgrades, widens probe of Saturn Aura cars

* Probe now potentially affects almost 89,000 cars

* GM discontinued Saturn brand in 2009

Nov 14 (Reuters) - Federal safety regulators have upgraded and widened an investigation into Saturn Aura cars over a transmission shift cable that could fail and cause the park gear not to fully engage.

The National Highway Traffic Safety Administration said it was upgrading its probe to an engineering analysis from a preliminary evaluation into