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Q: Trouble with check engine light every time I drive the car on 1994 Mercury Grand Marquis

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Check engine light keeps coming on. Every time I drive the car. Advised by the mechanic that the sensor light needs replacing What would the cost be for this.
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Hard to tell which sensor they are talking about, But its usually the oxygen sensor and you can check that price here http://repairpal.com/estimator?car_type_id=5523 and get another opinion here http://repairpal.com/directory?address=71457&car_brand_names=Mercury
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