Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
Read more: http://engine-codes.com/p0171_bmw.html
愿意探究细节的话，可以看看这儿：
转自BMW X5论坛的一篇同类问题：http://www.bimmerfest.com/forums/showthread.php?t=471632
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
Read more: http://engine-codes.com/p0171_bmw.html
愿意探究细节的话，可以看看这儿：
转自BMW X5论坛的一篇同类问题：http://www.bimmerfest.com/forums/showthread.php?t=471632
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