Not Reading O2 Sensors
Thread Starter
Navigator
Joined: Aug 2014
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From: Layton Utah
Not Reading O2 Sensors
My 1997 C5 started out with the code to replace bank one sensor one, so I did. Shortly thereafter the code came up to replace bank two sensor one, so I did. Then the code came up once again for bank one sensor one, I checked the sensor per directions from a thread in the forum and all was well. Had the code reset, went for awhile and now I'm getting the code that none of the sensors are reading. Any suggestions, I'd appreciate some help. Thank You!
Le Mans Master
Joined: Sep 2014
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From: Kelowna BC
Are you talking about P0430 and/or P0431? If so, it is telling you there is an issue with either the sensor and/or the cat on the respective side. Maybe you have a bad cat?
Or... are you talking about front sensors?
Or... are you talking about front sensors?
Thread Starter
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Joined: Aug 2014
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From: Layton Utah
Thanks grantv! I don't recall all 5 codes but for sure the first on was PO134. I'll get a codes tonight when I get home and post a reply.
It was the front sensors.
It was the front sensors.
Last edited by kirtp; Jun 4, 2015 at 06:30 PM. Reason: Didn't answer a question.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
There are several things that can cause O2 Sensor headaches. Before you empty your wallet and last nerve, take a look at this schematic and do some troubleshooting. Actually measure the voltage ON THE FUSE test points (on top of the fuse) to chassis ground and make sure that you are reading FULL battery voltage on the heater circuits:
You will notice that the OXY SEN fuse is SUPPLIED by the "IGNITION SWITCH" If the ignition switch isn't supplying the proper voltage,,, the sensors will NOT function properly, no matter how many you install.
You should also look at the ground and the splice pack. Here is what can happen to that splice pack if the battery ever leaks or gets gassy!!
Bill
You will notice that the OXY SEN fuse is SUPPLIED by the "IGNITION SWITCH" If the ignition switch isn't supplying the proper voltage,,, the sensors will NOT function properly, no matter how many you install.
You should also look at the ground and the splice pack. Here is what can happen to that splice pack if the battery ever leaks or gets gassy!!
Bill
Thread Starter
Navigator
Joined: Aug 2014
Posts: 9
Likes: 0
From: Layton Utah
There are several things that can cause O2 Sensor headaches. Before you empty your wallet and last nerve, take a look at this schematic and do some troubleshooting. Actually measure the voltage ON THE FUSE test points (on top of the fuse) to chassis ground and make sure that you are reading FULL battery voltage on the heater circuits:
You will notice that the OXY SEN fuse is SUPPLIED by the "IGNITION SWITCH" If the ignition switch isn't supplying the proper voltage,,, the sensors will NOT function properly, no matter how many you install.
You should also look at the ground and the splice pack. Here is what can happen to that splice pack if the battery ever leaks or gets gassy!!
Bill
You will notice that the OXY SEN fuse is SUPPLIED by the "IGNITION SWITCH" If the ignition switch isn't supplying the proper voltage,,, the sensors will NOT function properly, no matter how many you install.
You should also look at the ground and the splice pack. Here is what can happen to that splice pack if the battery ever leaks or gets gassy!!
Bill
Kirt
