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O2 sensor problem?

Discussion in '1st Gen. Tacomas (1995-2004)' started by luckydogie, Dec 13, 2011.

  1. Dec 13, 2011 at 6:08 PM

    luckydogie [OP] Member

    Dec 13, 2011
    01 prerunner
    I have a problem with my cel and my o2 sensor. Last November I replaced rear o2 sensor with oem denso, replaced front probably 6 months before that with oem. Code came on last month bank 1 sensor 2 and I just replaced it with a bosch # 13618. Now my check engine lights on with code po420 and the o2 sensor has'nt reset but no light yet. I'm wondering If this Bosch sensor set this off or my cat is really bad? Any help would be appreciated as my inspection ran out last month. 2001 tacoma prerunner 3.4 auto

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