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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 03-08-2006, 03:12 AM   #1 (permalink)
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engine light??? help

my engine light came on, now i took it to BMW dealer and they put it on dianostic and it came back saying that Cat faulty etc, dose this mean i need to replace the cat or could it be some thing else
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Old 03-08-2006, 11:59 AM   #2 (permalink)
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Possibly a bad Oxygen sensor. If it gives a false signal to the computer, then the computer may think that the catalytic converter isn't working property. It's much cheaper to replace an O2 sensor than a cat.

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