Have an issue with my '04 3.7 V6
It's showing codes p0174, p0175, and p0151

 

p0174 System too lean bank 2.
p0175 System too Rich bank 2.......
p0151 O2 sensor circuit low voltage bank 2....

I think fix the last one, and that should solve the other two. See what kind of voltage you are getting at the sensor connector, engine running. Should have one pin with 5 volts, and a second pin with 12. (sensor, and heater circuits, respectively)

 

Does that mean that the sensor is bad or that there's a bad connection?

 

Bank 2 is passenger side, just follow the pipe, it'll be in front of the cat.

There is also the possibility that you only have ONE "front" O2 sensor, and the PCM just interprets the signal to decide which bank it is reading.... If that's the case, then something else is going on.

 

04 3.7 will definitely be a 4-sensor system. Lean/Rich is not determined by the downstream, so I'd be looking at that upstream sensor. As HeyYou said, pre-cat passenger side.

 

Thank you all very much. I'm currently stranded in Miami, Florida. I've got a multimeter but I really don't know how to use it.
So do I need to replace the O2 sensor? I mean, is that the general consensus here?

 

Could just unplug it, see if it runs any better...... That WILL set codes, but, the engine should still run decent.

 

Oh!
Okay

 

I disconnected the O2 sensor and that didn't help. Actually it idled for about 3 minutes and shut off

 

Something else is going on then. Would it restart right away? Or did you have to wait some?