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Q: If an O2 sensor is it will it always turn on a check engine light on 2003 Ford Taurus

The thing is when I start reving at about 5000 my car trys to shut off but I think it is an O2 and how many are there anyways?
And it also starts doing the same thing as I am slowing down almost as if it doent know how much gas to send to the engine.
The mechanic said one O2 sensor wasn't working properly but I dint want anymore testing because it was costly
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Testing is a lot less costly than guessing! That is all we can do without some test info. Did you get any trouble code numbers for the check engine light from the mechanic?
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