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Q: engine boggs down on accel, o2 sensor code (out of limits) on 1990 BMW 325i

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Car has 150 compression on all cyls. hit deep water on highway. drained fluids and checked valves, all ok.Ran perfectly for @2hours and then stalled.Check eng light went on with code for o2 out of limits. Replaced sensor and tried different ECU. Any ideas where to go from here?
(1) Answer
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if the air mass sensor got hit with water, it is most likely history. it's expensive, so let a BMW specialty shop check this out.
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