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You should do a search of this forum (80 series tech) for P0125. You most likely have a bad #1 O2 sensor or the harness/wiring may be damaged. It would be very helpful to know if your coolant temperature is registering on your dash gauge. Most likely your coolant temps are normal but the lack of input from the O2 sensor won't let it get out of closed loop; hence the P0125. If you have over 150K miles on your O2 sensors this might be a good place to start. That and purchasing an Ultragauge or Scangauge. Good luck.
again, most likely your #1 O2 sensor. You'll get the P0170 when your fuel trim is too high/too low.
Solid, thank you.
I'm thinking about just switching them to see if the condition improves, the part numbers are the same.
The part numbers are not the same for a 1995-1997 1FZ
Thanks for the reply......Did you ever track down the problem?