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PO 141 code that won't go away.
06-25-2017, 01:45 PM
Post: #1
PO 141 code that won't go away.
Hey guys first post here so hopefully I can get some help.

I have a 2005 Mazda Tribute S. Has a 3.0 engine and automatic transmission.

So I went to go get the car inspected the other day and they told me that the car wouldn't pass emissions because of a PO141 code. Which is a bank 1 sensor 2 heater circuit malfunction code.
So cleared the code and immediately pop ups which points to a bad sensor because it didn't even have time to self test. I did get a new one and put it one just to verify and same thing.

I'm getting 12 volts on the heater circuit but can't find a ground on the other. Monitoring with my voltmeter I am getting a signal off of the black signal wire but it's lower than I expect but it is moving .02-.6 is what I'm seeing.

So doing some research I want to ohm the second wire to the PCM to make sure that it hasn't been shorted or broken but I can't find any diagrams on the pcm connectors anywhere. I'm pretty sure at this point I have a shorted cable or a bad PCM. Any help on this would be great appreciated.

Thanks guys!
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06-25-2017, 11:46 PM
Post: #2
RE: PO 141 code that won't go away.
If you can't find any damage to the harness then most likely it's a bad PCM. This is where a full function scanner might come in handy.

That said, are you sure you're dealing with the correct sensor? This should be the one to the rear of the cat.
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