QuestionI have a 1996 sedan deville the problem i am having is when i try to start it i have to kepp cranking it when it starts it idles up and down from 550 rpms to 775-850 rpms up and down i took it and had the check engine ligt code read and it came up oxygen sensor bank 1 sensor 2 i bought a oxygen sensor for after the converter and tried them two then i bought a o2 sensor that is right next to the radiator and still no luck if u have any advice i would appreciate it thxs alot
AnswerThere are TWO seperate reasons for o2 sensors to raed faulty.
One is a totally dead sensor and the other is that the o2 sensor(s) are seeing to MUCH or to LESS air/fuel mixture passing thru the sensor(s) thus causing the light to illuminate on the dash panel in the vehicle.
The o2 sensors were showing faulty most likely due to the uneven engine rpm's.
Once you diagnose and fix the idle speed problem the o2 sensors will NOT show as being faulty.
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