Page 4 of 4 FirstFirst ... 234
Results 31 to 33 of 33

Thread: Cat drive cycle

  1. #31
    Quote Originally Posted by YotaFun View Post

    The year difference is weird, I will have to double check, I can't remember it it was 99 or 00 where the front o2 sensor changed to an A/f sensor and the tolerances for emissions tightened up a little bit.
    It depends on whether its a CA or federal emissions truck. The 99 and 00 CA models use a wideband AFR sensor, however a 00 federal emissions model (like mine) still uses the older style narrowband O2. By 2001, essentially all models were like CA models.

  2. #32
    Quote Originally Posted by paddlenbike View Post
    It depends on whether its a CA or federal emissions truck. The 99 and 00 CA models use a wideband AFR sensor, however a 00 federal emissions model (like mine) still uses the older style narrowband O2. By 2001, essentially all models were like CA models.
    Thank you for the clarification! I am curious now what my 00 4Runner now.

  3. #33
    Quote Originally Posted by YotaFun View Post

    The year difference is weird, I will have to double check, I can't remember it it was 99 or 00 where the front o2 sensor changed to an A/f sensor and the tolerances for emissions tightened up a little bit.
    FWIW, my California emissioned '99 has an air/fuel sensor up front. When it went out it threw a code. Prior to that I hadn't noticed any change in mileage or performance. Changing the sensor cleared the code and gave me great mileage that eventually tapered back to normal.

Page 4 of 4 FirstFirst ... 234

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •