325i computer system. when cold the car runs good but when at operating temperature the car runs rough and bearly idles and sputters while revving out. any thoughts?
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car runs horrible
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02 sensor. You should have the lambda code 1221 tho. Mine did the exact same thing, runs great at cold but poor idle when fully warm. Replaced o2 sensor and mpg and idle quality back to normal.
Also vacuum leak might be possible, try a smoke test.Owner - Bavarian Restoration
BMW and European Electronics Repair and Restoration
www.BavRest.com
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