96 Olds Cierra---O2 sensor

I have a 96 Cierra and the other day the code P0135 for the o2 sensor "bank number 1" came up. I cleared the code, but it happened about a month ago and I wonder if I should just replace the sensor.

I assume this is the one in the pipe by the engine, which I believe is cylinder bank 1. Another sensor is located downstream in the exhaust pipe as well. The error message said something about "heater circuit" or something to that effect.

Thanks
Mike

I have 2 codes being tripped.
The first is P1133 which is telling me insufficient switch bank 1,
and the other is code P135 which mentions heater circuit bank 1,
anyone have any thoughts or links to trouble codes for this car?

I am about to change the o2 sensor closest to the engine hoping that this is "bank 1" and that this will cure the problem.

1996 Olds Cutlass Cierra
3.1 V-6


THanks
Mike

Changed the O2 sensor and cleared the codes. Seems to have fixed the problem. :smile: