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2004 Mazda Mazda6 Question: have code p0171



cabin fever, 3.0L V6, Mount Arlington, NJ, October 15, 2010, 04:00

what could be the prob?

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  • Answer #1

    October 15, 2010, 06:14

    The P0171 indicates a lean air-fuel ratio. It could sets by several different reasons i.e.: dirty, restricted injectors, bad or dirty Mass Air Flow Sensor, disconnected or leaking vacuum hoses, leaking intake manifold gasket, leaking exhaust , O2 sensor etc...
    You can check for disconnected or broken vacuum hoses and maybe clean the MAF sensor. CRC sells a good MAF cleaner, you can buy it in most parts store. Don't use other chemicals, you can damage the sensor.


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