P0171 BMW -

Question

I want to know if i disconneted the air mass flow sensor at the time the car is warm up, i was replace the ignition coil 0302 for misfire

Answer 1

P0171 Fuel trim lean Bank 1

P0174 Fuel trim lean Bank 2

If you have a P0171 and P0174 and you disconnect the MAF when the engine is running it would code a MAF circuit high code condition. Wrong sparkplug can set this code condition , or even the PCV system