Strange issue

[Doomer4567]

So currently my ranger a 3.0 v6 manual is showing three codes, two of them are both my engine banks are running lean and the third is saying my o2 sensor bank 1 sensor 2 is is out. I already replaced the o2 sensor and it came back.

Now here's where it gets confusing. I did a live test and it says all three of my o2 sensors have no voltage, as far as I know i have no evap leaks and we replaces my MAF sensor recently. Also my compressor is failing but I just think its going bad

My theory is either one of my 02 sensors is shorting and causing issues or my pcm or a similar control module is failing. I wanted to get people's opinions as i cant just throw money at parts until it gets fixed. Thank you for any help!

Edit: I couldnt pull codes at the time but the codes are PO171, PO174, and PO141

 

[2011Supercab]

We're going to need the actual code numbers, otherwise we are going to have to take guess's

 

[xeris]

Check if the O2 sensors have reference voltage to them.

 

[Doomer4567]

Check if the O2 sensors have reference voltage to them.

I believe it's around .1 to .9 but the test says 0.0000V

 

[xeris]

I need to check, but I thought the reference voltage was .5V

 

[19Walt93]

Keep in mind that "O2 sensor out of range" is a symptom and not a diagnosis. The scan tool should be set to display codes. I agree that we need the codes to try and make sense of it.

 

[SenorNoob]

IIRC there is no "reference" for an O2 sensor. Then only thing you're gonna see with a meter is the reading of rich (0.9vdc) or lean (0.1vdc).

 

[Doomer4567]

The codes are Po141 (the sensor is brand new), po171, and po174.

 

[Mechrick]

There is no 'reference voltage' on the O2 sensors. There is 12v to the heaters, but that will only be there if the PCM wants the heaters on.

90% of the time, P0171/P0174 is caused by air leaks or vacuum leaks on Fords.

 

[Doomer4567]

There is no 'reference voltage' on the O2 sensors. There is 12v to the heaters, but that will only be there if the PCM wants the heaters on.

90% of the time, P0171/P0174 is caused by air leaks or vacuum leaks on Fords.

What would be the easiest way to check, I was hoping it wouldn't be that because it could go from a 5 min fix to im outside making a pop-up mechanic shop.

 

[Mechrick]

I would grab a scanner and look at fuel trims.

Another way to do it is spray water around suspect leak points and look for the engine to stumble.

 

[stmitch]

How does the engine idle/run? Is it running rough or misfiring? If so, under what conditions?

 

[lil_Blue_Ford]

Since nobody mentioned it…

Have you checked all of your fuses? I had no o2 sensor reading on my F-150 and couldn’t figure it out until I found a blown fuse. Then my next thought was what made it blow. Fortunately that truck is relatively easy to trace wires and sure enough the wire chafed through on a bolt and shorted out.