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Code PO155 02 heater circuit (bank 2 sensor 1)

Tiny
LOUISLANDA
  • MEMBER
  • 2002 BMW 325I
  • 6 CYL
  • AUTOMATIC
  • 100,789 MILES
Hi last week I was driving in the freeway and the car heats up then the motor stops I look at it the thermostat was liking water and the tensioner was missing the next day I replace those but the check engine light is continue on then I check in auto zone the code appears is po155 o2 heater circuit (bank 2 sensor 1)you think is the sensor or just wires of the sensor?The light is on since 4 months ago I before check but the auto zone staff toll me is only the thermostat the po155 is not appear that time. Where is located this sensor?What do you think is the problem the sensor or the wires?Thanks in advance to help me with my questions
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Thursday, February 3rd, 2011 AT 8:43 PM

7 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Inspect the wires for melted insulation. Replace the thermostat. Tensioner missing? What does that mean?
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Thursday, February 3rd, 2011 AT 8:48 PM
Tiny
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  • 4 POSTS
When stop running in the freeway I look at it. The micro-v belts was broken and the idler pulley was missing or broke I think that cause the problem I replace those next day the car runs good now but the engine light continue on.I need emission for my plates this can affect the emission test?Were is the sensors and wires I need to check?Sorry but my English is not so good thanks.
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Thursday, February 3rd, 2011 AT 9:49 PM
Tiny
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Scan for the reason that the check engine light to be on and report back.
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Tuesday, February 8th, 2011 AT 2:35 PM
Tiny
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I check in auto zone the code appears is po155 o2 heater circuit (bank 2 sensor 1)you think is the wires or the sensor?Were is located this sensor and wires?This affect the emission test?
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Tuesday, February 8th, 2011 AT 9:24 PM
Tiny
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  • MECHANIC
  • 9,601 POSTS
Inspect for bad wiring or maybe you will need to replace the sensor. Yes it will effect the emissions.
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Tuesday, February 8th, 2011 AT 10:32 PM
Tiny
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Ok I will you can tell me were is the location of this sensor please?
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Wednesday, February 9th, 2011 AT 10:46 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Exhaust manifold. If you dont know what you are doing in this repair, I strongly recommend you seek out someone with BMW experience. The car is expensive to own and maintain. If you cannot afford to do so, I think you might consider what your priorities are.
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Thursday, February 10th, 2011 AT 2:35 PM

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