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

I have a P0135 code which sensor is it

by in Blackwood, NJ on July 31, 2013
2 answers 1 comment
ANSWER by on July 31, 2013
which motor do you have?
ANSWER by on July 31, 2013
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.
COMMENT by on July 31, 2013
THANKS i'LL GIVE IT A LOOK