Rep Power: 0

I just plug in my code scanner and i got this p0138 high volts(bank 1,sensor 2).

I have test pipe(stright pipe) from hp. I not that worry it is my secondary o2 sen. I'm worry about the pimary o2 sen. What do the code mean it is my second o2 or pimary? can you really tell?

 
Rep Power: 0

Try these websites linked below for help:

Site #1
The site above recommends replacing the O2 sensor, and resetting the ecu by unplugging the batery cable.

Site #2
From the site above:
> On the P0138:
> P-0138 1/2 O2 Sensor Shorted to Voltage
>
> SYMPTOM
> P-0138 1/2 O2 SENSOR SHORTED TO VOLTAGE
>
> WHEN MONITORED
> With the engine running for more than 2 minutes and coolant temperature
> above 170 degrees F .
>
> SET CONDITION
> The oxygen sensor voltage is above 1.2 volts .
>
> POSSIBLE CAUSES
> 1/2 O2 sensor signal circuit shorted to voltage
> 1/2 O2 sensor wiring harness observable def
> 1/2 O2 sensor wiring harness or connector intermittent def
> 1/2 O2 sensor connector terminals observable def
> 1/2 O2 sensor defective
>

Site #3
The people in the above post received this error after installing after market exhausts.