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Changed both O2 sensors and still getting their codes.

 
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Old 17 May 2017, 05:37 pm
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Default Changed both O2 sensors and still getting their codes.

I replaced both O2 sensors after my CEL came on and the car started to hesitate, idle rough and stall. I put the reader on it, showing O2 sensors bank 1 and 2. After replacing them, I cleared the codes through the reader but the light comes back on and the problems are still happening. The only codes I am getting are for O2 sensors bank 1 and 2. This is driving me nuts, does anyone have any ideas?
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Old 17 May 2017, 05:38 pm
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Default Re: Changed both O2 sensors and still getting their codes.

What are the actual engine trouble codes you are getting?
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Old 17 May 2017, 05:41 pm
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Default Re: Changed both O2 sensors and still getting their codes.

Bad grounds on the left fender could be the culprit. Just because they are crimped to the eyelet is no indication the ground is good.
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Old 17 May 2017, 09:52 pm
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Default Re: Changed both O2 sensors and still getting their codes.

Both H02s replaced and still getting DTC may mean a PCM issues.
You would need to replace the PCM
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Old 18 May 2017, 02:40 pm
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Default Re: Changed both O2 sensors and still getting their codes.

I'm no expert But /\ /\ This guy /\ /\
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I bet good money on it and have ....and will.....W..
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Old 19 May 2017, 05:18 am
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Default Re: Changed both O2 sensors and still getting their codes.

You need to look into what the o2's are telling you. Lean/ rich. If both banks chances are you have a effecting the whole engine. My money is on a vacuum leak but just a guess. The systems needs to be diagnosed you already did the parts swap.

Check for broken vacuum lines. Listen for hissing and see if you can locate where it is coming from. You can try to blow smoke through the vacuum line going to the power brake booster and see if you see any smoke coming from the engine.

Good luck
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Old 19 May 2017, 08:47 am
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Default Re: Changed both O2 sensors and still getting their codes.

A Thought. ^^
If you pull a line, lets say a BIG one like the PCV I doubt you would activate a DTC having to do with the H02 after the engine has warmed up let alone 2.
Now if you had an exhaust manifold leak at the head or very close to the H02s perhaps?
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Old 19 May 2017, 12:53 pm
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Default Re: Changed both O2 sensors and still getting their codes.

Codes are 0031 and 0037. I also have an 0700 transmission code.
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Old 19 May 2017, 01:15 pm
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Default Re: Changed both O2 sensors and still getting their codes.

We have found that the recurring EDT in a PT Cruiser PCM even after changing both HO2s and also new existing TCM warnings that the PCM may be in a state of issue.
We will usually do a pass through or flash to see if this resolves the problem. If we know that no engine work has recently been done that any wiring harness or wires could have been damaged than the suspect generally is the PCM.
I seem to be repeating myself so time for me to exit this thread.
unless I need to defend my responses

Hope you resolve it soon and with the least expense to resolve the problem.
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Old 19 May 2017, 05:20 pm
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Default Re: Changed both O2 sensors and still getting their codes.

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Originally Posted by War_Eagle View Post
Codes are 0031 and 0037. I also have an 0700 transmission code.
These codes are very common and especially prevalent on the turbo Pts. Don't waste your money trying to flash it to fix it. It seems that the poor air circulation under the hood, and the close proximity to the high heat generated by the turbo, cooks the ECU. The O2 circuits seem to be most prone to this high heat and those circuits fail first.

Exhaust all other diagnostic trouble shooting first to see if it could possibly be something easy like a vacuum leak or poor grounds, but be prepared to be buying a new/used replacement ECU.
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