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Another PO420 thread

Discussion in '1st Gen. Tacomas (1995-2004)' started by keebler94, Dec 5, 2011.

  1. Dec 5, 2011 at 8:30 AM
    #1
    keebler94

    keebler94 [OP] Member

    Joined:
    Nov 22, 2011
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    SW Virginia
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    01 SR5 4X4
    I have a 2001 Tacoma SR5 2.7 with 210,000 miles. Some background...have had the CEL on for several years, when it first came on i got it checked 1135 & 0125. Upstream O2 sensor and a thermostat. I finally got those 2 problems fixed. Replaced w/ a OE denso O2 sensor.
    Drove about 50 miles when I got another CEL...this time 0420. After searching these forums, Im still not sure if it is a cat problem or the downstream O2 sensor. The exhaust system has been worked on recently, so I dont think it is a leaky exhaust. I work night shift so I will check underneath on my way to work to see if the cat is glowing red!
    Until recently I only lost 1 or 2 MPG with the CEL being on and about two weeks ago I noticed a loss in power and even less MPG.
    After replacing stat an O2 sensor, I've still got power loss and piss poor MPG's......
    Any suggestions or advice would be helpful! Thanks!
     
  2. Dec 6, 2011 at 10:19 AM
    #2
    keebler94

    keebler94 [OP] Member

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    01 SR5 4X4
    checked last night- no glowing cats or any kind of rattle in them.
    so my question is... where do i start? downsteam o2 or get the cats replaced?
     
  3. Dec 6, 2011 at 3:18 PM
    #3
    rll131

    rll131 rll131

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    elkton md 21921
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    i just asked the same question i took it to the shop he said the cat was bad and i myswell change the o2 sensors also not sure if you have a v6 or not but i think the v6 has 2 cats so you might have to replace both.
     
  4. Dec 6, 2011 at 5:17 PM
    #4
    dirtslngr

    dirtslngr Active Member

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    sbonnoiv@gmail.com
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    sbonnoiv@gmail.com
    same problem here, keebler. Mpg loss is annoying
     
  5. Dec 6, 2011 at 7:28 PM
    #5
    keebler94

    keebler94 [OP] Member

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    i guess i will replace the downstream sensor and go from there
     
  6. Dec 6, 2011 at 11:02 PM
    #6
    bellassaiw10

    bellassaiw10 Formally afroman5015

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    Clean you MAF Sensor thats what my problem was
     
  7. Dec 7, 2011 at 10:15 AM
    #7
    keebler94

    keebler94 [OP] Member

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    I will try that and see what happens....doesnt seem to hard to clean the MAF sensor! Thanks
     
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