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emissions or engine

  1. 1991 E39 530i Touring Sports - Emissions/Engine problems

    BMW 5 Series - Tech Talk For All Gen Of 5 Series
    Hi my car failed its MOT on lamba sensor readings co2 and h20 passed mechanic said coils and plugs replaced still failed MOT, found air leak on intake side replaced hose now car sounds like a tractor smokes like a diesel and goes 10 mph!! Mechanic said head knackered. Why would car go fast with...