Pelican Parts Forums - Question on BMW 3-Series E36 O2

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- - Question on BMW 3-Series E36 O2_Sensor (http://forums.pelicanparts.com/101-projects-discussion-forum-bmw-3-series/759082-question-bmw-3-series-e36-o2_sensor.html)

94 325i with single o2 sensor. Replaced sensor and reset the computer, after a few minutes of running rough it ran great again. 800 miles later it started running rough again. Exchanged the old sensor for a new one and started running smooth again. 1000 miles later same problem. Don't think I can exchange it a third time. Why is it going out so quickly? Each time I have been getting the 1221 code.

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This post was auto-generated based upon a question asked on our tech article page here:

You could have an issue with sensor contamination. Check that there is no oil or coolant leaking into your exhaust system, ruining the oxygen sensor.

- Nick