Oxygen sensor low voltage
 

I have a 1998 V6 3.8

I recently checked two codes one is P0131 Oxygen sensor low voltage bank 1 sensor 1, and seond code P0151 Oxygen sensor Low Voltage bank 2 sensor 1.

Does that mean I have to replace both, or there is a way for solving this problem?

Thanks in advance for your help.

First thing I would do is make sure your MAF wire is clean by spraying it with MAF Cleaner, without touching the delicate wire -- as I recall the two issues can be related.

Are you using an oiled air filter? If so, that can transfer to the MAF and create issues. It also could be dirty from other things.

If it ends up you still need new O2s, look into Denso O2s, read:
http://www.camarohomepage.com/project/part3.htm