Oxygen Sensor
MY 95 mustang hesitates from a start, idles very rough when cold and the check engine light is on. I have replaced the oxygen sensor with a generic oxygen sensor. The dealer told the problem was the generic sensor and that I needed a ford oxygen sensor. Is this true or is he just trying to sell me somthing. What could be causing all of problems? The obd codes said it was runing too lean.
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