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  1. P0171 Fuel trim too lean Bank 1 - Giulietta MA 1.4 2014 TCT

    Alfa Giulietta
    So after potentially diagnosing the vibration on idle i had in my other thread where a suspected engine mount was too blame ive done a little more, its still there but now i have noticed - On idle revs hold at 750 rpm, then begin to surge to 1000 then back to 750, when revs increase the...
  2. P0171 diagnostic code

    Alfa Giulietta
    Hi all, changed the oil(selenia) on my 1.4 MA and after driving for about 20 miles the engine management light came on and it wouldn't let me change out of Normal mode, also no start stop. Had a friend put his OBD on and it came back with that code , which relates to lean mixture on bank one.Any...
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