WHAT ARE THE CODES FOR THE UPSTREAM AND DOWNSTEAM O2 SENSORS on 1999 Toyota Tacoma

I have a P0135 code which sensor is it

2 answers 1 comment
which motor do you have?
135 is the upstream or front sensor OR CIRCUIT! Check fuses as this circuit is for the 02 sensor heater which may have a bad fuse, possible.
THANKS i'LL GIVE IT A LOOK