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check engine light

  #1  
Old 08-07-2007, 05:06 PM
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Default check engine light

my check engine light came on so
I ran an obd2 code puller and came up with this; P0420, catalyst system efficiency below threshold(bank 1)
anyone got an ansewer for me??????
thanks

 
  #2  
Old 08-07-2007, 05:12 PM
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Default RE: check engine light

o2 sensor its better to replace both at the same time
 
  #3  
Old 08-07-2007, 05:17 PM
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Default RE: check engine light

o2 sensor has been replaced recently(both) but, the manifold sensorwas one I wired myself(new sensor,old connector 4 wire) Could this be cat. converter?
 
  #4  
Old 08-07-2007, 05:24 PM
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Default RE: check engine light

i got the same prob. i replaced both on mine and stupid cel still comes on [:@] i just said hell with it even though i still waste more gas but i ll fix it when i go home. have u tried looking at the wires and making sure there not messed up or have corrosion on them. u could also check with the voltage meter or whatever its called to check if the wire is busted.
 
  #5  
Old 08-07-2007, 05:34 PM
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mxs
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Default RE: check engine light

either your cat is bad, or your second O2 sensor is bad
 
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