One problem related to o2 sensor has been reported for the 2005 Chevrolet Malibu. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Malibu based on all problems reported for the 2005 Malibu.
I own a 2005 Malibu with 160,000 miles on it. On June 16, 2011 I took my car to the dealer's service center because a week prior my car doors unlocked and my engine shut down as I was driving down the street. This happend twice about four days apart. They replaced the oxygen sensor. Aweek later it started doing the same thing but about every two to four days. I took it back on July 16, 2011 and they could not find anything wrong and told me to bring it back when I could leave the car there. Now this has become a daily occurance, even happening two to ten times a day doing it 6 times within driving less that a mile at times. Luckily it starts right back up and that I still have control of the steering and brakes.