2007 Tahoe 5.3 Flex O2 Sensor Wiring Diagram

joned

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A long story I will shorten it the best I can.

I bought a 2007 Chevy Tahoe 4x4 with 95000 miles on it from my girlfriends dad. It had some issues mostly used in the countryside hunting, fishing, camping, etc. Living in the countryside they did not need to follow emission standards that us city folk do, so when they got the engine code for O2 sensor failure they just ignored it. Cut all wires to be honest, although why they didn't bother explaining that part.

Now its mine, runs great, did a lot of minor fixing here and there but need to get the sensors right so it can pass emissions and get her registered. I followed a lot of guides that I can find online, wiring diagrams, etc, but cannot get this correct. I always end up with the codes P0036 and P0056. I got new O2 sensors and errors messages for both sensor 1 have disappeared except for these two that come up for number 2 sensors. Mentioned that they cut the wires for some reason, well they did but not the front ones only the rear (downstream) sensors. Why? I don't know.

So i found a pair of male pig tails for the downstream sensors and haven't been able to get the wiring straight. At least that is what I think it is. Checked fuse, its ok. Tested wires to see if there were any breaks and nothing that i can find. The pink wire has the correct voltage. I know the pig tails I found the wire colors weren't perfectly matched but as long as the wiring is correct, A-A, B-B, C-C, D-D, it should be good. They fit the new O2 sensors perfectly. I haven't done a complete installation (using black electrical tape until I am sure that the wiring is correct because I don't have a lot to be cutting off) so I am stuck where I am. And the error has not gone away, P0036 and P0056. I bought Bosch brand O2 Sensors all around and the basic color configuration is two white wires (A-B), one gray (C), and one black (D).

So what I am asking is can anyone help me with a wiring diagram for this Tahoe? I have attached a picture of the wires that are coming out of the Tahoe. The first is for Bank 1 and the second for Bank 2, they are slightly different from each other. And I have yet to find any information that references these exact wire colors. Some close but no exact match. Maybe that is my error, assuming too much. If not maybe the whole catalytic converter just needs to be replaced. But there were no error messages pointing in that direction.

Thanks for any help.
 

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zora

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Didnt the original O2 sensors have wire colors that matched the colors of the remaining wire harness attached to the vehicle?
 

joned

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Oh yeah. Notice how the top banner says "2007 Chevrolet Truck Tahoe 4WD Oxygen Sensor Connectors Repair Guide" yet every thing listed beneath it does not agree with this. I went through every one of these attempts, also notice how the color code they provide has one black wire yet the pictures of the wires coming off from my Tahoe, there is no black wire.

If you go through all diagrams you'd find that the most recent they offer, according to their site, is for 2003 - 2005. Even those wires don't watch what i have coming off of my Tahoe.

Thanks for the input tho.
 

joned

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Didnt the original O2 sensors have wire colors that matched the colors of the remaining wire harness attached to the vehicle?
No they cut the wires so close to the O2 sensor you couldn't even see the color of the wires coming out from it.
 

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