Question about 2003 Ford Taurus

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Engine r.p.m. go up and down in idle

Check engine light is on,hesitates at stop light. code is 1131 and 1151

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  • Sergey F
    Sergey F May 11, 2010

    Here are the code meanings:

    P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor
    Indicates Lean - Bank No. 1
    Possible solution - Replace O2 Sensors.

    P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
    Possible solution - Replace 02 Sensors.

    Your car could also be due for a tune-up. Spark plugs, wires, coils, dist cap/rotor (if applicable)

    All depends on mileage of car. O2 sensor need to be replaced after / around First 60k mi, 150k mi, 220k mi.

  • Sergey F
    Sergey F May 11, 2010

    What kind of car is it? Make and model and year please.




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  • Contributor
  • 12 Answers

Air hose leak.

Posted on May 30, 2009

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My personnel fix for this.

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