All O2 sensors showing bad after replacing all of them ??

Pierce Vaughn · May 7, 2020

Howdy folks, hoping to get some help figuring out this issue.

My CEL has been on for a while and I knew it had to do with the O2 sensors so I got around to replacing those and I’ve been driving it for over a month now and it still has a CEL. It shows a code for all four of them. Is there something upstream from the sensors and wiring boot that could be causing this ? Has anyone had this happen before ?

I just got my key fob replaced and want to see if the remote start is working but it worst let me with a code !

Thanks for the Input

-Pierce

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davester · May 8, 2020

what are the codes? could be you got bad sensors, or there's a wiring problem. or there's other problems with your vehicle.

Pierce Vaughn · May 8, 2020

what are the codes? could be you got bad sensors, or there's a wiring problem. or there's other problems with your vehicle.

It has codes P0036, P0037, P0056 and P0057 for bank #1 sensor #2, and Bank #2 sensor #2. I just replaced all of them because it had O2 codes. And replacing them didn’t fix it.

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LDM · May 8, 2020

Did you reset the codes after replacing the O2s? If yes, how long before the codes came back?

You should really hook up a data logging scanner to the truck and monitor the O2s in real time. See if they are functioning at all. If not, it sounds like you have a wiring issue. All 4 O2 sensors going bad at the same time and 4 new ones all bad is almost impossible.

davester · May 8, 2020

In general, codes aren't of the type "this code = replace this part". For any given code, there is a list of things that could be causing it, that you go through to figure out where the problem is, then you can fix the problem.

Pierce Vaughn · May 8, 2020

Did you reset the codes after replacing the O2s? If yes, how long before the codes came back?

You should really hook up a data logging scanner to the truck and monitor the O2s in real time. See if they are functioning at all. If not, it sounds like you have a wiring issue. All 4 O2 sensors going bad at the same time and 4 new ones all bad is almost impossible.

They came back almost immediately I believe. I am going to see if I can hook it up to a scanner to get a live look at them. Other than that I guess I’ll be tracing wires back to the pcm.

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BlancoSilverado · May 8, 2020

Do you have any data coming from them? Can you see data that they are producing?

carkhz316 · May 10, 2020

Better fire up the parts cannon and replace them again.

You got the codes. All of them indicate a heater control circuit malfunction. Check your fuses.

Pierce Vaughn · May 11, 2020

Better fire up the parts cannon and replace them again.

You got the codes. All of them indicate a heater control circuit malfunction. Check your fuses.

Thanks for the replies. I’ll check the fuses. I’d hate to have to place them since I just bought all of them. Seems unlikely that ALL of the ones I just bought would be bad. Seems more like fuse/wiring so I’ll try to make sure that’s all good. If the catalytic converters are shot will it have different codes than just o2 codes?

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