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Q: 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
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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.
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