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  1. D

    O2 sensor circuit

    Was right on the color of # 2 pin at ECU... jumpered that wire to Ox senser and then got a PO 125 code quick......took jumper back off and got PO125 and PO 135...replaced ECT sensor which helped nothing...traced wiring as far as i could in both directions..checked O2 sensor i bought and it...
  2. D

    O2 sensor circuit

    Found my problem..........
  3. D

    O2 sensor circuit

    It is an automatic trans also
  4. D

    O2 sensor circuit

    My truck is a 1999 tocoma regular cab 2.4 engine ..had a code PO 135.. replaced upstream sensor with Denso...code came back..checked at connector..had 12v on plus side and no grd from computor key on.The wire from grd at o2 sensor is purple with black stripe...think at ECU a wire that color is...
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