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Q:

where are the O2 sensors and how hard is it to change them?? on 1993 Dodge Spirit

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check engine light is coming on and the car is having trouble staying started. The dealership said it was the o2 sensors.
(1) Answer
You have 1 O2 sensor located on the exhaust pipe just behind the flex joint. Provided that it is not rusted in place, you should have no problem replacing it. There is an off-set O2 sensor socket which makes it easier to replace, but it can be done with a short open end wrench.