P0171 Mazda -2004 check engine light on

Question

No problem in engine start or run,

Answer 1

P0171 Fuel trim system  RH system too lean

When you get lean condition right side , you may also code up P0174 lean condition  LH, what can cause lean condition and no readily drivabilty condition may be a simple need to do a MAF (mass air flow ) cleaning, This can help reset the fuel trim