Auto Repair Forums

Full Version: PO 141 code that won't go away.
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
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!
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.
Reference URL's