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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 03-28-2006, 07:41 PM   #1 (permalink)
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PO155 SES Code - O2 Sensor

Anyone know how critical this error code is?
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Old 03-28-2006, 08:37 PM   #2 (permalink)
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P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

Is this urgent to get checked out?
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Old 03-28-2006, 09:33 PM   #3 (permalink)
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it just meant the Heated o2 sensors heater is not working and that the O2 sensor doesn't heat up within the allowed time, it does eventually heat up via exhaust gasses and cycle (or you would have an O2 sensor fault as well) No major rush unless you want that SES light to go away
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