The most common problem with the 2003 Oldsmobile Alero is the failure of the passlock sensor in the ignition lock cylinder. This causes the security system to prevent the car from starting. Replacement of the lock cylinder corrects the problem.
The 2003 Oldsmobile Alero's second most commonly occurring problem is the failure of the turn signal switch. This causes the turn signal to flash when the switch is in the off position. Replacing the switch corrects the problem.
The third most common problem with the 2003 Oldsmobile Alero is the failure of the front window sash brackets. This causes the window to come off of its track. The brackets can be replaced to correct the problem.
The 2003 Oldsmobile Alero has been recalled by General Motors to replace the ignition switch. It was also recalled in 2004 for a sticking accelerator.