Question about 1999 Volvo C70

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I have fault code p1171 on my 1999 volvo C70 - 1999 Volvo C70

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  • sstevens612 Mar 12, 2009

    Thanks Guru, It runs fine when driving but at idle can be 'lumpy' bouncing from 500rpm to 1000rpm, not all the time but once warm in particular.

    Any ideas?

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90% of the Time..Code 1171 is an 02 sensor. Other 5% Is a Mass Airflow Sensor.. And Last .. Fuel Pump.. If engine seems to run fine.. its an O2 sensor.. Thank you

Posted on Mar 12, 2009

  • Bruce G. Oct 03, 2011

    Hi Tommy,
    I have an 01' C70 2.4T w/ P1171 code and idle runs rough then when brought up to 2000K rpm smooths out. Could not find any issues with vacuum leaks, replaced the MAF. Does this sound like an O2 sensor or something else (EGR or emissions ourge valve or other) Thank-you very much!! Bruce

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