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long or short

  1. Long/short term fuel trim

    Alfa 147, 156 & GT
    I've been suffering with intermittent engine management warnings and p1177/p1178 errors, both 'stored' and 'fatal'. After clearing the errors they stay clear for a while, from a few days to a week and then return. I've replaced one lambda sensor as it was producing a flat 0.2v signal, but...