Thread: Which O2 sensor is #1??
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Old Oct 15, 2005 | 12:08 PM
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Fermunky
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Default Which O2 sensor is #1??
I recently got a 94 BMW 740il, and had a Check Engine light throw code 1221, which is O2 Sensor 1... I have 2, and imagine it is the first one inline with the exhaust... anyone confirm this? Thanks.
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