BMW Repair Questions? Ask a Mechanic for Answers ASAP
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P0170: fuel trim bank oneP0173: fuel trim bank twoP1250: misfire with low fuel
the most common cause of these codes is an intake air leak so you need to check for leaks or have the intake smoke tested
other causes of these types of codes would be a failed crankcase vent valve or failing airflow sensor - but an air leak is most common.
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