So Im trying to fix my moms 97 Grand Prix. Im getting code PO141, which claims it is the O2 sensor heater circuit. It doesn't say which O2 sensor though. The is one before and one after the cat. Anyone got any ideas? I dont want to spend $150+ on 2 O2 sensors and have that not be the problem.

 

This might help you

http://www.automotivehelper.com/topic648439.htm