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2002 OBDII code PO155 Heated Oxygen Sensor

Tiny
HANHANK
  • MEMBER
  • 2002 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 86,000 MILES
Check engine light is on. Diagnosis is Heated Oxygen Sensor bank 2 sensor 1 needs replacing. Where is it located. And how do I do it? Thanks.
Saturday, August 2nd, 2008 AT 6:26 PM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You did not tell us what make or model you have? Most front drives, it's the sensor on the front side of the engine. The first one you come to at exhaust manifold to the converter.
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Saturday, August 2nd, 2008 AT 6:38 PM
Tiny
TITO78
  • MEMBER
  • 6 POSTS
Bank 2 means on the passenger side. follow your exhaust pipe towards the front of the vehicle. you will need a small flat head screw driver to remove the clip and an adjustible wrench or an open end box wrench(recommended) to unscrew the sensor from the exhaust pipe. at a auto parts store tell them you need the O2 sensor for 2-1. not all sensors have the same length for the wiring. the sensor looks like a 8 inch long spark plug with wires attached to the back. remove clip, unscrew sensor, replacement is reverse.


https://www.2carpros.com/forum/automotive_pictures/226165_O2_sensor_2.jpg



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Sunday, August 10th, 2008 AT 7:36 PM

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