URGENT toyota tacoma trouble code P0420 -Catalyst System Efficiency below Threshold.

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  #1  
Old 11-09-04, 04:03 PM
henrydd
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URGENT toyota tacoma trouble code P0420 -Catalyst System Efficiency below Threshold.

Hi
I'm getting a code P420 Catalyst System Efficiency below Threshold- on a 2001 Toyota Tacoma V6 3400cc. What should I do ?URGENT-PLEASE REPLY TONIGHT THANKS.
 
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  #2  
Old 11-09-04, 04:14 PM
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Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
If I were you I would hurry up and replace the catalytic convertor.Then when things were less urgent I would find out why it failed.Since I read some of your other posts you already know why.
 
  #3  
Old 11-09-04, 04:22 PM
henrydd
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Thanks DAvo
I just replaced the a/f sensor just before the cat. The code is a pending code.
 
  #4  
Old 11-09-04, 05:40 PM
Join Date: Jun 2002
Location: Long Island, NY
Posts: 1,531
Pull the battery to rest the learned fuel trim values.

Then I would just drive it based on you previous A/F sensor problem the cat may have become "dirty". The check lite may or may not set, clear it once if it does and see what happens.

You may be able to "clean" the cat with a properly running engine
 
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