2001 Chevy Blazer Oxygen Sensors

2001 CHEVROLET BLAZER
112,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JSINES
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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?
Oct 28, 2009 at 8:48 PM
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OBXAUTOMEDIC
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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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Oct 28, 2009 at 9:03 PM
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BMRFIXIT
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Check O2 sensors fuses under hood fuse box
check wiring
before replacing sensors
Oct 28, 2009 at 9:06 PM
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