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what po170 and po 173 means on a 98 bmw 740i

what po170 and po 173 means on a 98 bmw 740i and how can I repaired my self I`m getting ready for smog inspection

Vehicle: 1998 bmw 740i 4.4?
asked Oct 4, 2013 by Jose Meza

1 Answer

P0170 Fuel trim malfunction bank 1

P0173 Fuel trim malfunction bank 2

Do a MAF (mass airflow) cleaning, using a approved MAF cleaner solution, also look for any vacuum leaks especially at the brake booster hose.

answered Oct 5, 2013 by Reynaldo (10,835 points)

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