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Trouble Code Definition

Tiny
MBFETSKO
  • MEMBER
  • 2002 TOYOTA HIGHLANDER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 126,500 MILES
I have a 2002 Toyota Highlander (V6, 2WD) with a Check Engine Light activation. The OBD-II scanner shows only one code - P1155; the description I have been able to find reads "A/F Sensor Heater malfunction Bank 2 Sensor 1". My Haines Manual has proven worthless to me.
I would like to know exactly what this means, where the sensor is located and if this is something that I can address myself?
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Saturday, January 8th, 2011 AT 9:38 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It means the heater is not working on the 0/2 sensor for Bank 1 upstream. That is usually a bad sensor when only one of them codes.
That would be the upper sensor on the driver's side.
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Saturday, January 8th, 2011 AT 10:20 PM
Tiny
MBFETSKO
  • MEMBER
  • 6 POSTS
Just to make certain we're both looking in the same location. This sensor is the one on the manifold closest to the radiator and obviously visible?
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Saturday, January 8th, 2011 AT 11:53 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
As I said, it's the sensor before the converter on the left side of the engine.
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Saturday, January 8th, 2011 AT 11:59 PM
Tiny
MBFETSKO
  • MEMBER
  • 6 POSTS
Thanks for the confirmation!
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Sunday, January 9th, 2011 AT 12:10 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Closing out question
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Friday, March 11th, 2011 AT 4:33 PM

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