Two problems related to o2 sensor have been reported for the 2002 Saturn LS. The most recently reported issues are listed below.
The oil and antifreeze have a common wall in the radiator. The antifreeze is corrosive and ate thru allowing the oil and antifreeze to mix in the engine causing the engine to be completely rebuilt with most parts replaced. The temp gauge has been replaced 4 times as the engine runs cool and will fail inspection and destroy the O2 sensors. The power steering pump has gone out 2 times as well as the ac compressor. The rear lights on the driver side are always getting hot and burning out. The taillight fittings for the stop light have gotten so hot that they needed to be replaced 3 times. Dash lights are constantly flickering when you apply the brake or (when it is running) turn on the ac unit or the heating system. The safety latch on the front doors have been replaced 2 times as they were cracking. I paid for all of the repairs and was told that there was a recall based on the antifreeze that gm used as it was corrosive and affected many models of gm cars. I filled in all of the forms for the class action suit and at the end I was told that the Saturns were not covered - that the government had allowed this class to be removed from the gm claim. This was not fair as it was the same problem caused by the corrosive antifreeze used by gm and the poor design of using a common thin wall to separate the oil and the antifreeze.
2002 Saturn l200 when driving at night the lights flicker as well as the vehicle engine stalled out on expressway and the air conditioner became inoperative. Saturn suggested that the flickering was normal. In very hot/humid weather, the engine would run hot ad the air conditioner would stop running. On two occasions the vehicle refused to start. The service dealer suggested that the catalytic converter was plugged and the oxygen sensor was replaced due to the stalling. All four tires were replaced because of an alignment, toe and camber problem.