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I was receiving p0171 & p0174 on 2006 3.0i,
I would attempt to use MAF sensor cleaning spray 1st and if that does not work replace the maf sensor to clear p0171 error
the spray worked for a few hundred miles but I did end up replacing sensor
spray about $8, maf sensor between $20 & $300(oem)
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Rich Wilson
2006 X5 3.0 6Speed
Build Date 10/12/2005
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