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| View Poll Results: po420 | |||
| right sensor |
   
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0 | 0% |
| 1 st cat |
  
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1 | 100.00% |
| 2 nd. cat |
  
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0 | 0% |
| 2nd or 3 rd. sensor |
  
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0 | 0% |
| Voters: 1. You may not vote on this poll | |||
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#1
03-29-2005, 07:43 PM
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po420
my 1996 ford bronco check engine light keeps coming on. I scanned the code and it says po420, catalyst system efficiency below threshold bank #1. I'm trying to understand but what does this mean ? i have one oxygen sensor on left and on right side, then a cat. followed by an oxygen sensor, followed by another cat. does this mean i should check to see if the sensor after the first cat is bad? or could the first cat be bad ?
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#2
04-16-2005, 11:44 AM
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Re: po420
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