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2001 Chevy Blazer Oxygen Sensors

Tiny
JSINES
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 112,000 MILES
2001 Blazer - 112,000 miles

OBD code shows PO135 & P0155 representing Bank 1 & Bank 2 Sensor 1 respectively. Is this unusual that both sensors are bad? Would appreciate you advice prior to replacing. These sensors are located before the cat correct?
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Wednesday, October 28th, 2009 AT 8:48 PM

2 Replies

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

If they are the only codes you are getting, first thing I would check is the wires. These O2 sensor are located in the exhaust manifold. And it is possible if you have had any work done that the wire may have been moved and lying on the exhaust wear they could have been burnt.

Also not sure with that vehicle but check to see if there are any fuses. I believe they are heated and there should be one or more fuses.

Mark S

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Wednesday, October 28th, 2009 AT 9:03 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check O2 sensors fuses under hood fuse box
check wiring
before replacing sensors
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Wednesday, October 28th, 2009 AT 9:06 PM

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