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my 2004 bmw is runing lean and i replaced all 4 02sensoers on 2004 BMW 325xi

it runs good 4 a bit than starts runing like its hesitating lite comes back on i usesd car quest sensors lite comes back on for 02sensors

Asked by for the 2004 BMW 325xi
Could be several reasons. Most likely your old sensors were not the problem. Could have a vacumme leak or mass air sensor problem. I reccomend that you have some one run a diagnostic test.