1997 chevy Blazer 4.3 vortec 4×4 post cat O2 sensor problem

This topic has 14 replies, 7 voices, and was last updated 12 years, 5 months ago by EricTheCarGuy.

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July 20, 2012 at 11:00 am #458850
moparfan
Participant
have you checked for power and ground to the 02 sensor heater?
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Viewing 14 replies - 1 through 14 (of 14 total)

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July 20, 2012 at 11:00 am #458851
college man
Moderator
can you post the actual code that was read?
July 20, 2012 at 11:00 am #458852
EricTheCarGuy
Keymaster
Yea what’s the code?
July 20, 2012 at 11:00 am #458853
dreamer2355
Participant
Welcome to the forums and +1 on the code number for us to help you more C8-)
July 20, 2012 at 11:00 am #458854
Matt
Participant
Well, I agree, the code is much needed here.
July 21, 2012 at 11:00 am #458855
chevymann106
Participant
[quote]Quoted From Beefy: _x000D_
_x000D_
Well, I agree, the code is much needed here.
July 21, 2012 at 11:00 am #458856
chevymann106
Participant
[quote]Quoted From moparfan: _x000D_
_x000D_
have you checked for power and ground to the 02 sensor heater?
July 21, 2012 at 11:00 am #458857
dreamer2355
Participant
A DVOM will not be able to update quick enough, Your best bet is a scope or graphing meter for your o2 sensor readings.
July 21, 2012 at 11:00 am #458858
moparfan
Participant
like stated above you will need a graphing meter or a scope to do a good test on the 02 sensor. it will be much faster with the CEL code.
July 21, 2012 at 11:00 am #458859
Matt
Participant
Since you say you’ve replaced the sensor 3 times, and all the exhaust, then the next step is to inspect the wiring to the sensor itself.
July 22, 2012 at 11:00 am #458860
chevymann106
Participant
So i got the truck scanned and the code came up P0146 Bank 1 sensor 3 HO2S an according to alldata this DTC pops up when the vehicle control module detects no HO2S activity, Any ideas on where to go from here?
July 22, 2012 at 11:00 am #458861
rice400
Participant
check the wiring integrity all the way back to the PCM
July 22, 2012 at 11:00 am #458862
college man
Moderator
heres a link for a little trouble shooting_x000D_
_x000D_
_x000D_
_x000D_
http://www.obd-codes.com/p0146
July 22, 2012 at 11:00 am #458863
chevymann106
Participant
Thanks for the link i will check tomorrow and see how things turn out. I will repost the results around the same time thanks again
July 23, 2012 at 11:00 am #458864
EricTheCarGuy
Keymaster
Since you’ve replaced the sensor without result I would check the wiring all the way back to the computer, you could have a wire or connector problem somewhere.
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1997 chevy Blazer 4.3 vortec 4×4 post cat O2 sensor problem

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