This E46 came in with DTC's P0171 & P0174 codes for lean running engine. I go thru some of the common areas to test and how the MAF readings led to finding a plugged up air cleaner E39 E53 383 X3 X5 Z3 Z4 E60
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BMW P0171 & P0174 System too Lean How to Diagnose & Repair Smoke Test Crank Case Pressure and MAF
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