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