Thoughts On Seemingly Contradicting Codes CEL Codes?

[1998K1500]

Ignore the double use of Codes in the title, that was an accident.

I've had a check engine light on for a while and knew it was an o2 sensor after the catalytic converter so I just ignored it and pushed it off all winter. Spring's here now and I figured it's time I got this fixed.

The codes are p0137 and p0138 (low voltage to bank 1, sensor 2 and high voltage to bank 1 sensor 2 respectively).

If only one of these codes were thrown it would make sense, however how can the same sensor possibly throw a code for low voltage and high voltage? Shorted wire...? Just a bad o2 sensor (I'm thinkin not but don't know for sure)?

Any thoughts?

 

[RHamill]

Erratic signal, can throw a code for .1 volt and high 1.2 volt

 

[1998K1500]

So what exactly should I do to fix that? I'm getting sick of the check engine light always being on

 

[RHamill]

Get a new o2 sensor, or pull the bulb out...

 

[Scrufdog]

bad O2 sensors can be all over the place, change it.

 

[SAATR]

Clear it, drive it, see which one comes back. I would expect a possible broken wire that's intermittently open and then shorted. Inspect the wiring and pins closely for damage.

 

[1998K1500]

Looks like I'll be changing the o2 in the near future to see if it helps. I don't think it's an old o2 though and I'm really suspecting wiring issues but I'll change it anyways.

Clear it, drive it, see which one comes back. I would expect a possible broken wire that's intermittently open and then shorted. Inspect the wiring and pins closely for damage.

I did clear and drive it and both codes came back, which led me to this post. I'm gonna look into the wiring though cause I suspect you're right on that call. Thanks.